Performance Harley Exhaust - Facts & Myths

The Urban Myth that Harley's Need Backpressure is perpetrated by almost everyone, including "Techs" at Dealerships. Watch the Video, if you still think Backpressure does not Rob Power from Your Harley, Let us Know in a Comment. ⬇️⬇️⬇️⬇️⬇️ Click Show More Below ⬇️⬇️⬇️⬇️⬇️
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The DK Team

[@Bonesyzfr1]

I am a master auto tech and you are absolutely correct.

[@DKCustomProducts]

Thanks for watching and commenting. Much appreciated. 👍

[@Backyard_customs]

I’m 19 just got a 2008 nightster Will I have to have the bike tuned to open the exhaust more?

[@slayer04031974]

Question? How is this any different than applying a finger to a garden house to create a stream or using a solid beam vs large hose with no nozzle? I know using smooth bore nozzle you get more volume of water vs pressure. But you get more distance of water with a smooth bore. I guess it there would have to be a way to measure the flow rate and depending on the size exhaust and heat loss slow down gases and loss of pressure. I would think?

[@Marc_Remillard]

No ........ Harley's NEED backpressure....... Just to stop.them sounding "hollow"......to fill the exhaust to make them THUMP, not the hollow tin can sound.....

[@therepairpal4187]

All of your vids a great! I have never heard backpressure explained like this before, makes perfect sense to me now.

[@DKCustomProducts]

Cool. Glad you found the video useful. Thank you for the comment.

[@jackklarich7045]

Thanks for this very good video. I am still amazed @ all the misinformation so many still buy into about exhaust. This should help many who have been taught wrong

[@DKCustomProducts]

Jack, thanks! Means a lot coming from you. Yep, agree with you. 👍

[@deathnite8834]

Love your thunder torque inserts. I installed a set on my 4in custom straight pipe mufflers and made a huge difference. Adding the inserts gave me a great balance in sound. The inserts noise level is a great middle ground between straight and stock. Highly recommend these especially if u want loud pipes and still be able to hear ur radio.

[@DKCustomProducts]

Thank you for your comment. Good to hear you are enjoying the benefits on your ride! Appreciate your business!

[@jackcompton8752]

Thanks for the schoolin! Great supporting info. Give a little here... gain a little there. I rode quite a while with your TTI's before saving enough for pipes. They worked great for me! ✌

[@DKCustomProducts]

Thanks for the comment! 👍

[@cootey]

This is a great video, very well explained. S&S mastered this a long time ago and even tell their customers, leave the removable baffle in the exhaust for tuning, for this exact reason. I fitted a set of S&S Grand National slip-ons to my FXLRST, left the baffles in and it runs beautifully. APE also tune their bikes with a baffle still in for all but the most mental racing tunes for the same issue.

[@DKCustomProducts]

Good add! I am glad you are liking the videos. Thank you for your comment!

[@stevenmunizich9366]

Good to the point video. After decades of doing stuff to my engines and exhausts on various Harleys I'm done. My stock 114M8 runs fine.

[@DKCustomProducts]

Good to hear you're enjoying your current ride!

[@garycarver1005]

Love this thanks for dropping some wisdom on us! 💪

[@DKCustomProducts]

Thank you, glad you found the video useful! 👍

[@SyntaxZer0]

Love these videos, and I like the way you guys break it down. Only thing I can criticize is I wish you guys had some clip on mics or something because your audio is so much quieter than the other clips. Other than that, keep it up guys! Thank you for what you do.

[@DKCustomProducts]

Thank man, appreciate the comment. We have tried lapel mics, along with an amazing number of different configurations. We are better than we were, but still not happy with the audio. We're gonna keep trying....sometimes we realize that making motorcycle parts is easier than making videos!!! lol

[@SyntaxZer0]

@@DKCustomProducts just keep doing what you're doing! We appreciate it y'all.

[@rakkasanveteran1619]

Now I completely understand what you mean by reversion. I've bee trying to figure that out all week, and this just explained it. I'll be gutting the cat once the rain stops and ordering your TTi's today also. Thanks for the info, really helps!

[@DKCustomProducts]

Glad you found the video helpful! Here is a written report on Exhaust that also simplifies it that you may find helpful - www.dkcustomproducts.com/harley-exhaust-myths-and-facts.htm Please feel free to contact us with any questions; [e-mail] 662-252-8828 Thanks for commenting!

[@davehuber6296]

Thank You for this information

[@DKCustomProducts]

Appreciate the comment and hope you found it useful. Thanks for watching our channel. 👍

[@randydixon5621]

I've got the large thunder tourques in my 18 ultra. No cat, no other baffles in stock slip-ons. Sounds great runs great

[@DKCustomProducts]

Thank you for the feedback. That is what I am currently running also. Produces very good power. Appreciate your business, and happy to hear you are liking them. 👍

[@twister8ful]

Thanks for your info 👊🏻 I'll be sure be getting some

[@DKCustomProducts]

Glad you like the video! Please feel free to contact us with any questions you might have; [e-mail] 662-252-8828 Thanks for commenting!

[@Chubbychonies]

Put TTI in my shorty freedom pipes, was surprised at the difference, and the sound changed to a deeper growl. Love them. I’d like to see the dyno difference on some of these pipes. That’s a video I think people would like to see. The gain on a dyno…. I appreciate what you guys do !!

[@DKCustomProducts]

Thanks for the comment. Glad to hear your digging the TTI's. That is a really good idea on video of a some dyno work. We are going to be spending a few days on a dyno later this year, testing a bunch of different parts. We will do that also for video. We did spend many days when developing the TTI's and there are quite a few dyno charts that can be seen at this link- www.dkcustomproducts.com/thunder-torque-inserts-c57.htm

[@Chubbychonies]

@@DKCustomProducts thanks. I don’t think I’ve seen these dyno charts.

[@johnchlipala5079]

Appreciate the video fairly new to riding a Dyno 1600, and was really torn if I should remove the baffles or not, well after listening to you fellas I pulled the trigger and removed the baffles, what a difference! Sounds amazing, unless it's in my head, but seems to have more power at all rpm ranges! Thanks guys I'm a subscriber for life!

[@zachhalle6711]

Restrictions actually does mean less power....you can't take out the baffles with out increasing air flow.....and tune....if it's EFI.....

[@lancereagan3046]

I am glad someone finally laid out the story in more detail. Back pressure is the "only" word thrown around in the shade tree mechanic world. The reversion half of the equation is seldom mentioned, but is 1/2 of the formula.

[@DKCustomProducts]

Glad you like the video! Here is another more recent video on backpressure that you may also find interesting - kzbin.info/www/bejne/o4uYZIyFlLeNZqc Thank you for commenting! 😎 MB

[@louisrkellerjr]

You guys are spot on , Thank you !!!

[@DKCustomProducts]

Thank you, appreciate your kind words and watching our vids. 👍

[@zachhalle6711]

Way off...explanation on restrictions of exhaust but no explanation of what happens with intake pressure....🤘 hey 😁 Diesel tech/ trailer mech here and motorcycle mech.....and I ride my own harley.... This video only explains half and only supports removing baffles with half the explanation...

[@zachhalle6711]

Wouldn't say spot on.....missing alot of what really is going on ...intake manifold pressure.....intake restriction....oil used.....etc....exhaust pressure is only a small part in performance.

[@robbyclark6915]

I have learned more in the 12 hours I found your channel than I have in the whole 9 months I’ve been riding!! Absolutely, positively, going to be ordering your products for my little 883! I think I’ll start with the breather and catch can. I want to eventually go to a full stage 1.

[@DKCustomProducts]

Thank you for your kind words. Happy to hear the videos have been useful. Always feel free to call or email us with any questions. We appreciate your business. 👍

[@robbyclark6915]

@@DKCustomProducts Awesome! Just ordered a 587 air cleaner and a vied fuel management device for my iron 883. It’s still under the factory warranty and I thought I would hold off for now on the tuner. Might get some slip ons too if this isn’t enough performance upgrade? I think if I cut out the baffles and cat from my stock mufflers and install thunder torques I will likely upset the finicky Harley warranty.

[@brute616]

You two are the most knowledgeable harley guys I've seen on the internet! I was wondering what your thoughts are on the HPI exhaust?

[@DKCustomProducts]

Thanks for the kind words, and glad you are finding the videos useful. We have not tested any of the HPI exhaust, so about the only thoughts we have on them is ... They are EXPENSIVE.

[@stevencoleman4149]

While I am not a new rider, I am new to working on HD's or really any motorcycle that I have owned. I have however built multiple automotive engines for both drag and circle track racing in my many decades ago youth. I completely agree with everything you said and in fact believe it's the misuse of terminology rather than any disagreement with you. We would discuss the issue as "back pressure" rather than "reversion reduction". It is however, "reversion reduction" we were attempting to reduce.

[@DKCustomProducts]

Yeah, there is a lot of confusion in the Harley world about exhaust sound that many want out of their Harley and the loss of power that is experienced when slip-ons with little or no baffleing (no backpressure) are used. Bottom line is that backpressure robs power...it is not dissimilar to adding an extra couple hundreds pounds of weight to the bike. The ideal situation is to have no backpressure and no reversion. Another video that perhaps explains it well is here- kzbin.info/www/bejne/mGPQf2qij5Z2gtk And there is a written report on the subject at this link- www.dkcustomproducts.com/harley-exhaust-myths-and-facts.htm

[@BigFiveJack]

This is an ENGINEERING SUBJECT That Is Specific To Internal Combustion Engines, and Jason of EE Channel detailed the key points. OPINION does NOT belong in this discussion. Thank you for including the video segment that Jason presented on his channel.

[@DKCustomProducts]

Thank you for the comment, and glad you enjoyed!

[@dannyradigan5894]

I really like the video it confirmed what my friend and i were argued about .

[@DKCustomProducts]

Glad you found the video useful. Thanks for commenting.

[@richardanderson4916]

Interesting! Thank you!

[@DKCustomProducts]

Glad you liked it! Thanks for commenting!

[@rodneyjeanes2633]

I removed the baffles and tubes and Installed TTi’s in V&H 4.5” Titan exhaust. The sound is a bit louder with a nice low tone. But most of all there is more torque and power at the low and mid-range rpm. Hands down the best $50 I have every spent on my bike!!

[@DKCustomProducts]

Thank you for the great review, super happy to hear you are enjoying them. We appreciate your business.

[@zachhalle6711]

$50 😂 if it feels great for you...that's absolutely awesome.....but more power it does not give you...drag cars or motorcycles use short exhaust straight pipe...you restrict your exhaust...it's bad for power...if you take the baffles out you have to increase intake pressure....it's simple math.

[@NoNoCanadian]

Good topic here. It really comes down to what you want your bike for. Low to mid range torque for cruising, or high rpm drag racing. As an old street rodder I learned a bit about performance. Back in the day, we would start at the beginning,,,, Good flow carburetor with enough fuel delivery at max rpm, aluminum intake with smooth high flow characteristics and even they had different types depending on peak horse power verses rpm. 3 or 5 angle valve job for smooth flow. Headers for good flow exhaust gas and they had different types, again depending on max horse power at different rpms. open the headers up for racing. Mufflers back on for cruising. In short,,,, decide what rpm verses horse power range you want and decide from there. It's not just baffles or no baffles.

[@DKCustomProducts]

OR, you can have your cake and eat it too...after all, what good is it to have a cake and not be able to eat it? You can use TTI's which do very little (vast majority will not notice) to the top end, and they give a nice bump to cruising power (low and mid range). www.dkcustomproducts.com/thunder-torque-inserts-c57-241.htm

[@NoNoCanadian]

@@DKCustomProducts 😂👏👍

[@harleydave2316]

I run your torque cones in all of my bikes. Not only do they sound better than with a baffle (in my opinion) but also run excellent with no decel pop when tuned properly.

[@DKCustomProducts]

Glad you liking the Thunder Torque Inserts. Thanks for the comment, and we appreciate your business.

[@kerrylewis2581]

I've tried many different baffles over the years. My favorite was the HP plus baffles by Khromeworks because it just seemed to perform well. Flash forward many years and noise is now a concern especially when I hit the road for a two or three hundred mile ride.

[@DKCustomProducts]

Whatever pipe you choose, with the TTI's the tone will be deeper, a little quieter, and you will have more power. If you want quiet and max power, you cannot beat the Supertrapp disc style exhaust.

[@blair5plusmotorcycles396]

I have the Thunder torte inserts and I absolutely love them

[@DKCustomProducts]

Thanks for the comment and for your business, we appreciate it. Super happy to hear you're enjoying the benefits! 👍

[@fxrmike5145]

I really dig this channel.

[@DKCustomProducts]

Thanks man, that is encouraging to read. 👍

[@fxrmike5145]

@@DKCustomProducts I have a question about the xied. 08 street glide with after market slip ons. I'm going to get xied for the bike soon, but will have to wait for a bit on air cleaner. I just put external breather, still running stock cleaner. Will there be any issues with xied or vied with this setup for the time being? Sorry for being so long, I just want you to have my info

[@DKCustomProducts]

@@fxrmike5145 The VIED's work well with stock. You will notice an improvement. Many folks leave everything stock and just do this to get an improvement. They also work well with just exhaust mods, or just air cleaner mods, or both. If you go beyond air cleaner and exhaust, they will not do the job.

[@jeffanderson3356]

I did a S&S cam 2 into 1 into 2 head pipes and Bassani slip ons. And also installed the torque cones. Sounds and runs awesome torque up the wazooo…oh, I ride a 2020 114 Tri Glide. More power than I really need, but I freakin love it.

[@DKCustomProducts]

Glad your enjoying your Tri Glide. 👍

[@jeffanderson3356]

@@DKCustomProducts And for all the people following, I purchased pretty much everything for my ride from DK. Great place to deal with, top shelf in my opinion.

[@DKCustomProducts]

@@jeffanderson3356 Thank you for the kind words. We appreciate your business, and glad to hear you are enjoying the parts. 👍

[@jonirobey5442]

Cool explanation

[@DKCustomProducts]

Thank you!

[@ronlynch7744]

Yeah, good one on the controversy of BP. 😎👍🇨🇦

[@DKCustomProducts]

Thanks. Dwayne did not want to do this video...too many folks who "Know" that BP is absolutely needed.

[@nightcruiser99]

Installed the torque inserts today with baffles in after market 3 inch pipes and I feel like I can tell a difference with the motor reacting quicker and smoother.

[@DKCustomProducts]

Thanks for sharing. We appreciate your business, Great to hear you are enjoying the benefits of the Thunder Torque Inserts™. 👍😎👍

[@freefallfool66]

You are correct about not needing back pressure to create more power. The main reason secondary to reverberating backflow reduction, for needing some amount of back pressure, is to reduce valve lash. Excess valve lash can damage your valves, guides and potentially result in combustion chamber damage, if left unchecked long enough.

[@DKCustomProducts]

Harley's don't have valve lash, so this is irrelevant. Most cars & trucks since the 80's have also have zero valve lash. High revving Crotch Rockets may be of a concern with solid lifters, we have done no testing on them, so cannot say if it really makes a real world difference.

[@xlr8r3VA]

I added these to my 2000 883 and it made a difference I could feel. I have V&H Staggered Shots and removed the baffles before installing the inserts.

[@DKCustomProducts]

It's amazing what those little things do. Thank you for the comment, and we appreciate your business. 👍

[@xlr8r3VA]

@@DKCustomProducts no problem. I just bought a 95 Electra Glide Classic. I’ll be putting a set on that bike too.

[@DKCustomProducts]

Nice, thank you for the business, and I am sure you will like the results in that Evo. 👍😎👍

[@superduey53]

I agree with you ...liked the slinky dem.

[@DKCustomProducts]

Thanks, that was a good vid S&S did illustrating the energy pulse.

[@lpd1snipe]

I have an exception, and maybe it's an anomaly. When I started putting my 49 EL Panhead together eight years ago, I could not get it to run right running 1 3/4" drag pipes. No matter what I did, timing, carburation, you name it. I've been working on bikes since 1970. I'm a former merchant marine engineer, and I understand engines, but i'm not a professionally trained motorcycle mechanic. I worked part-time in a shop helping my buddy out years ago. I put a set of 4" long, shorty baffles in, and it solved the problem.The bike has run well ever since. I can't explain it, but I know it works.

[@DKCustomProducts]

Thanks for sharing! While the baffles did create some backpressure, this is not why you improved performance... In spite of the backpressure increase, the baffles prevented the reversion you were experiencing with the wide open drag pipes. Refer to the 1:50 point in the video for a very detailed explanation on reversion and how it robs power. The Thunder Torque Inserts™ are the best of what a baffle can be for these bikes... This style baffle prevents reversion, increases exhaust gas velocity, all while creating virtually no backpressure. DS www.dkcustomproducts.com/thunder-torque-inserts-c57-346.htm

[@RideAmerica]

Great video guys. Sure makes sense on how you explained it and I am one of those people who misunderstood back pressure. I just put on some CFR megaphone style mufflers but kept my stock headers. Are the headers enough to stop or slow down reversion? or would a torque insert still be beneficial? I don't see a cool way to add one on these mufflers and would be cautious about drilling into 800 dollar mufflers I just bought.

[@DKCustomProducts]

You can put the TTI's in the header and get some benefit, but will still have reversion slowing down the exhaust gas velocity in the mufflers....so it is of some benefit, but not as much as putting it at the tail end of the slip ons.

[@Shastar271828]

@@DKCustomProducts Should a megaphone still have a reversion occurring? Would have thought that a megaphone style pipe bell matches the impedance pretty well... perhaps only in some frequency range, and an exhaust pulse is still an impulse that contains all frequencies...

[@DKCustomProducts]

@@Shastar271828 Yes, when ever there is an atmospheric change (larger or smaller causes that) there will be reversion. With a megaphone opening it will be a little less severe (less negative impact) but it is most definitely still there.

[@boblafountaine9560]

OMG!!! Just wanted to let you know what happened after watching your video. I’ve had thunder torques for a few years now and I absolutely love the boost they give me. I developed a vibration for some unknown reason and couldn’t figure out why for the last 10 days. I had to loosen my headers to change the clutch fluid so I have been backtracking along the way. I did fix a small clamp leak but it still kept vibrating. Your video reminded me I hadn’t replaced the torque insert that I had removed and found my baffle had come loose where my torque insert was bolted onto the exhaust. Hopped on that baby and OMG, NO VIBRATION!! Thank you for your video !! Most satisfying video Ive ever watched!

[@DKCustomProducts]

Thank you for the kind words. Glad you are enjoying the videos and our parts...and have your bike back running well. 👍

[@recoilrob324]

A lot depends on how much overlap your cam/s have and where they're timed. You can make an engine run strong with a fairly restrictive exhaust if the cam timing will allow it and then if that engine has the exhaust opened up it'll lose power because it's over-scavenging. Same goes for an engine with open exhaust and cams that work well with little to no back pressure and then if you choke it with a restrictive exhaust it'll kill the power. The exhaust has to work with the cam timing which is why an adjustable exhaust is great for tuning. SuperTrapp types with removable discs that you can add or remove to change the exhaust sound and pressure work well. It's easier to tune the exhaust than change the cams to find a happy balance.

[@DKCustomProducts]

While this video was primarily made for OEM cammed bike (the majority of HD's out there are running the OEM cams), the principle is the same. Agree 100% with you, the exhaust needs to match up with all the other engine components, including the cam, to get the best results. The SuperTrapp disc style exhaust is an excellent way to do that, as are the Thunder Torque Inserts™. They both give adjustability, and the primary goal and result of them both is the reduction of reversion to speed up exhaust gas velocity, facilitating a better intake charge. Yes, that is very simplified, but those are the highpoints. Thanks for your comment. 👍😎👍 KP

[@fredaustrinojr8186]

i had a sportey years ago 74 i think open pipes the guy i sold it to put on shortys an he told me that gave him more. thanks.

[@joshhowell307]

Hello I’m new to your channel. Love the content and all the knowledge you are sharing. Thank you. Now…I just bought my first bike. A 2019 street bob with a 107. It came with LAF drag pipes. Can you tell me which thunder torques to order from you?? Thank you. Are they east to install and will they work on my pipes?

[@DKCustomProducts]

Awesome! Thank you for looking at our parts. Congratulations on your First Bike! 👍😎👍 Yes, the TTI's will work in your pipes, giving you a nice boost in low and mid range power, and deepening the tone a little. Here is a link to a chart on fitment - www.dkcustomproducts.com/choosing-the-right-size-thunder-torque-inserts.htm And here is a video you may find useful- kzbin.info/www/bejne/pJLUgad7mKmWi5I Please feel free to email or call with any questions [e-mail] 662-252-8828

[@ckthompson7928]

That's the first time I've heard it called reversion, I've been in the auto, truck, marine, and equipment repair industry for 26 years i have held ase technician credentials in about every area with the exception of engine management, I didn't pursue the Master cert as it didn't make a difference to my employer. Older techs used to call it back pressure or blowback ....not" blow by"... Which is when oil gets past the rings and gets into the intake system. Cool word I'm definitely going to remember that one.... Your absolutely correct about back pressure and reversion.... Been telling people that for years, you don't need back pressure..a friend of mine with a shovel head and full drag pipes was told to put a 1/2 bolt with lock washer in the bottom of the pipe about 2-3 inches from the tip .... He told me about it after we watched the video.... Said it made a dramatic difference in the pull it had thanks guys .... Needs back pressure??? 😅😂.... the world is flat right?

[@DKCustomProducts]

Great addition! Thank you for sharing. 👍😎👍 The Thunder Torque Inserts™ are a highly refined version of the bolt and lock washer you friend used. Here is a video about them- kzbin.info/www/bejne/qGOwqWSgi52Mr9E Works well with aftermarket 'free flowing" slip-ons also.

[@ckthompson7928]

I'm Definitely going to get a set to try in my RK ....

[@DKCustomProducts]

@@ckthompson7928 Cool, we're confident you'll be pleased with the results.

[@johnliotta2583]

All I know is I have python slip ONS with stage 1 and s&s 583 cams. Sounds very badass and moves great. Dk custom ebs too

[@DKCustomProducts]

That is great. I am betting that if you added the TTI's you would be even more pleased with the performance. Appreciate your business. 👍

[@KelvinWeiss-yv2zh]

I agree!

[@DKCustomProducts]

👍😎👍

[@johnkortgardner3221]

Hey guys, Found you discussion on back pressure informative. Makes sense. Most of the examples show the exhaust slip-on mufflers with first removing the inner baffle and packing then installing the torque plates. I have V&H Monster ovals on my 09 HD Ultra. I've looked for a way to remove the inner baffles and can't find a method. Do I NEED to remove these to install & benefit from your torque plates?

[@DKCustomProducts]

You do not need to remove the baffles to experience benefits from the Thunder Torque Inserts™. Here is a photo of some exhaust with the TTI's installed with the baffles still in. www.dkcustomproducts.com/media/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/e/r/eric_street_cannon_tti_3.jpg There are another couple of photos at this link- www.dkcustomproducts.com/choosing-the-right-size-thunder-torque-inserts.htm

[@joem1480]

I was literally just told before I picked what slip on's to buy from the Harley dealership was that I needed backpressure. I wish I had found this video before this. I was told get get a 4 inch pipe so I had proper backpressure for when I stage 4 within the next two winters.

[@DKCustomProducts]

Yeah, it is amazing how many folks perpetuate the myth of needing backpressure. Not sure what 4" pipe you got, or what baffle is in it, but for power and best running, using a Thunder Torque Insert™ in them will stop the reversion and make for a better running engine...stock & all the way up to Stage IV.

[@paulrevere4326]

So, we never spoke of how a cad converter plays into this. On an M8 motor, what is the ideal set up? Header with or without the converter? Slip on mufflers with or without baffle? Tell me the set up you would run. Great video!

[@DKCustomProducts]

The converter plays very little role in backpressure or reversion....but it would be slightly better without it, and would have the addes benefit of reducing felt heat. No baffles with TTI to stop the reversion. It will be louder. If louder is not your preference then the supertrapp style mufflers (very quiet) also do a great job of reducing reversion without a big increase in backpressure.

[@thejerseyj9422]

Exhaust gas velocity is the key. And it all starts at the exhaust valve. On a 4 stroke you want the spent gasses moving through the exhaust valve as quickly as possible. If they can be evacuated fast enough this provides somewhat of a vacuum effect in the cylinder. This vacuum helps to bring in air/fuel on the next stroke, the intake stroke. So anything that impedes exhaust gas velocity (such as back pressure) for whatever reason is going to hinder the cylinder from getting a full charge of air/fuel. Less air and fuel in the cylinder guess what, less power. That's why a motor is in essence an air pump. It's all about getting as much as possible through it. PS, I'm calling TODAY to order a set of Thunder Torque Inserts. 👍✌

[@davewilliams5781]

Wish i would have known that this was a advertisement may have paid more or maybe less attention

[@DKCustomProducts]

Great explanation! 👍

[@DKCustomProducts]

@@davewilliams5781 Even if TTI's had not been invented....it is still really useful information....if one is inclined to understand how and why things work on their motorcycle.

[@davidsantistevan7399]

Nice bike. I have the 09 deluxe same color. With 16" apes. I tried both with and with out. She ran little better with the baffles. I have slip on pythons

[@DKCustomProducts]

Thanks! Glad you are enjoying your ride! 👍😎👍

[@banayadryed]

DK Thunder torque is definitely good.

[@DKCustomProducts]

Thank you for the comment, and glad you are enjoying the extra torque out of the TTI's.

[@banayadryed]

@@DKCustomProducts really enjoy the simple yet effective small wonder insert..

[@MrJerryk55]

I believe your video, my question is about my Vance and Hines Q series pipes they are the long shots with 2 1/4 I D.Which of your product do I buy and does it come with instructions.

[@DKCustomProducts]

The 158's is what will work with the 2 1/4 ID. You can see them at this link- www.dkcustomproducts.com/thunder-torque-inserts-158-model-family-dk-tti-158.htm Yes, they come with instructions, which you can see at this link- www.dkcustomproducts.com/media/wysiwyg/exhaust/tti/11-6-19_Thunder_Torque_installation_instructions.pdf

[@JCcanU]

My bike Road king 95 1340 with Kirker thunder pipes 3-1/2 turn down at 3000 rpm it sounds like a out board, 3200 it quits, never lose power just sounds funky, twist of the throttle and im gone , I had SE heads same sound @ 3000 RPM went back to stock heads still doing it . but im happy the bike runs like a top .

[@DKCustomProducts]

I'm betting you will like the sound better, and enjoy even more power with the TTI's in those.

[@kennethwise7108]

My stock Evo Road Glide runs FANTASTIC in all stock configuration to include mufflers. Im happy with 65 hp. LOL

[@DKCustomProducts]

Happy for you!

[@johnchargualaf6599]

Very informative 👍. But I do have a question I’m running the Rinehart slimline exhaust with 4” Rinehart mufflers on a 2020 RGS. If I remove the baffles & install the thunder cone inserts what if any of a different would it be for sound & performance. Tia

[@DKCustomProducts]

Thanks for watching, and for your question. The power question is easy...You should see a 4-7 % increase in low and mid range power. Sound question not so easy. Every ones ears are different. It will be louder, but it will be a deeper tone, so it may not sound louder to you...deep sound at xx dB do not sound as loud (to most people) than a higher pitch sound at the same dB rating. Here is a good link where we discuss (and show dB charts) this subject- www.dkcustomproducts.com/harley-exhaust-myths-and-facts.htm

[@davidferguson5855]

I had unbaffled drag pipes on a Sportster and they made it much slower off the line. But then that thing really came to life around 80mph.

[@DKCustomProducts]

Add Thunder Torque Inserts™ to those unbaffled drag pipes, and that will stop the reversion, you will then have great low and mid range power without sacrificing that top end! www.dkcustomproducts.com/thunder-torque-inserts-c57.htm

[@Wheel-1]

Great video, When i take baffles out V&H Long shots on my EFI HD It sneezes / coughs and just carries on Acting as if the IAC Cant compensate . Thoughts ? Thanks for your time

[@DKCustomProducts]

That reversion is going back up those Long Shots and wreaking havoc with your intake charge. Use some TTI's to get rid of the reversion. www.dkcustomproducts.com/thunder-torque-inserts-c57.htm

[@Wheel-1]

@@DKCustomProducts Thanks for the quick reply . What one would i need for 04 fatboy

[@paulolourenco7260]

Hi. Brilliant video . Will be better to run the motorcycle without the silencers (DB killer)? To avoid backpressure. Regards

[@DKCustomProducts]

Glad you like the video! Here is another video on backpressure that you may find interesting - kzbin.info/www/bejne/bIiXoXljgdZnobM Here is a video that you may also find interesting - kzbin.info/www/bejne/hmbWaYyBesdjnac Thank you for commenting! MB

[@porkchopspapi5757]

If I can I'd like to propose what I think might be a big improvement in your 'lolypop'. Make them shaped like a hollowed out golf ball with a pointed nipple on the outside center of the half sphere. Round over the outside edge. And make it out of a low heat conductive material like aluminum. If my understanding of volumetric efficiency is correct, this would greatly increase the velocity of the exhaust & decrease back pressure. Just a thought.

[@DKCustomProducts]

Thank you...some interesting ideas that we may play with on the dyno to see how they do regarding the shape. We already tried aluminum, it will not hold up to the heat cycles and the vibration.

[@aaroncox3340]

Hey guys, another great video. I'm currently just finishing off my stage 2 on my ultra limited, and I'm waiting on my headers, I took the catalytic converter out, just getting welded etc. I only have one thunder torque insert because my previous Harley was a sport glide, (2 into 1) unfortunately I didn't end up using it, so, because I have dual exhaust, can I just use the one for the main pipe, I'm guessing no? ?

[@DKCustomProducts]

Never tried that. It would stop at least half the reversion...but honestly don't know if the imbalance would have a negative effect or not. Why not get another one? Only $30

[@aaroncox3340]

@@DKCustomProducts I'm in New Zealand, but I do have the twin cam touring spark plug leads I ordered which were wrong, because I have a M8. They are still in there package, (not opened) Send them back for a swap ?

[@DKCustomProducts]

@@aaroncox3340 Ack...shipping is expensive for just a TTI. On the wires, please email [e-mail] All RMA's need to be done in writing. Thanks!

[@TheYammerHammer]

I have argued with the best about this..... I'm running a 93" Shovelhead with 2 in drag pipes... I've got the carb and gearing dialed in about 135 mph.... I'm at about 4,500 elevation and I need to suck down a lot of air with little gas.... Pulling air in I need to push it out without causing harmonics reversion in the drag pipes.... It really does take a fine tune to make it run right. 2 in drag pipes (With out baffles) is what got Harley Davidson the world speed record for over 18 years.

[@DKCustomProducts]

Your scenario, higher elevation, high RPM's is especially vulnerable to reversion throwing a wrench in the works. Sounds like you have it dialed in really nicely.

[@mikerolla5601]

So my old torque cones that I installed at the heads was a good thing along with straight pipes cam and air cleaner!? I have a 2001 1200 custom Sporty. Seems to run quite well.

[@DKCustomProducts]

We have dyno tested a variety of different torque cones...did not see much improvement from them at all...some actually reduced power. They seem like they would work, but in reality, they just don't seem to reduce reversion. Check out the dyno charts at this link- www.dkcustomproducts.com/thunder-torque-inserts-c57-241.htm

[@mikerolla5601]

@@DKCustomProducts Thanks for the response.

[@anthonyjake9939]

Kevin & Dwayne, I received your TTI's last week. Ordered the recommended size for my Rush Big Louie's, the 258's. Last night I began taking out Rush baffles . The right side [cat side] came out easy. The left side I fought with for over an hour , and couldn't remove. I sprayed inside with WD40 tried all sorts of tools, I'm baffled.....lol. won't budge. Any suggestions? Should I heat bike up for 5 to 10 minutes and try pulling? It's really loged in there. Thanks for your time and help.

[@DKCustomProducts]

Have you called Rush for their advice on removing the baffle from their slip-on? For stubborn situations I use PB Blaster and let it sit over night. Make sure there is no second "keeper" bolt anywhere on the baffle. Sometimes need to use a twist & pull movement simultaneously.

[@Michaelobama184]

I remember my 1996 Softail Custom had shot gun drag pipes on it and they had built in baffles that were like glass packs and that bike had good torque and then I put some 40 inch drag pipes on it that were 1 3/4 inches in diameter and it sounded great but it seems like i lost some low end torque.

[@DKCustomProducts]

Yep, reversion reduces that low to mid range torque. Anything that reduces reversion, without putting too much backpressure is a net positive. Thanks for sharing your experience. 👍

[@adarngoodjoe4043]

I have no experience with the thunder torque inserts but it seems like they are trying to help you avoid the torque loss that occurs from a free flowing exhaust while still keeping the minor horsepower gain from a free flowing exhaust.

[@DKCustomProducts]

Here is a video with more dets on the TTI's- kzbin.info/www/bejne/mGPQf2qij5Z2gtk Also, here is a written report with more info- www.dkcustomproducts.com/harley-exhaust-myths-and-facts.htm The TTI's were developed for those that want louder than stock exhaust, And/Or more power than can be had with the stock exhaust. We don't really care about HP. On a Harley, up to 5225 RPM, what is felt is torque. Here is a video about that- kzbin.info/www/bejne/eoDbq4Fup5hohZY Since torque is what the majority of Harley riders like to feel when they twist the throttle, the TTI's were designed to get the most torque possible out of the exhaust, by increasing exhaust gas velocity, resulting in a fuller fresh charge for the combustion strokes.

[@hustle5150]

I have V&H straight shot slip on's with Big City Thunder monster baffles. They have a small washer located in them, would adding Thunder Torque Inserts help or hinder? If it would help, which insert?

[@DKCustomProducts]

The TTI's will help. Size chart is at the link below, or you can call or email in. www.dkcustomproducts.com/choosing-the-right-size-thunder-torque-inserts.htm

[@josephviglione4595]

I have a 13 street glide I put Vansen Hines in and took the baffle out and it runs fine

[@DKCustomProducts]

Yep, it'll run down the road just fine. If you put some Thunder Torque Insert™ in the V&H slip-ons, it will go down the road even stronger. www.dkcustomproducts.com/thunder-torque-inserts-c57-334.htm

[@Americanpatriot602]

- Fact ^

[@froberts120046969]

would torque valves installed at the heads do the same thing? Or could I also install the thunder valves with the torque valves I have already installed?

[@DKCustomProducts]

All the seat of the pants testing and dyno testing of torque cones, installed at the top of the header, provide little to no benefit. The whole principle of the Thunder Torque Inserts™ is to Increase Exhaust Gas Velocity by reducing reversion. The only place that can happen is at the end of the pipes, where the exhaust gasses exit into the atmosphere. Here are a couple of links that you may find useful/interesting www.dkcustomproducts.com/harley-exhaust-myths-and-facts.htm kzbin.info/www/bejne/pHOTiXeHi897b7s

[@b2db.fisher]

I have a 2019 FLHT with the 107. Thinking about using a 1.5” hole cutter to cut through front end of the stock baffles and getting the Thunder Torques…have you heard of anyone else doing that, and if so, what feedback did you get? Don’t want to remove the whole baffle as I think it would sound too hollow, but I could be wrong. What say you?

[@DKCustomProducts]

Here are a couple of videos where you can here with and without baffles, all with TTI's. kzbin.info/www/bejne/enzEkpp9jd2IsMk kzbin.info/www/bejne/faasmH5jp8hlqZY Yes, there are many that knock or cut the plug out of the stock baffles and run the TTI's with good improvement in low and mid range power. Here is a link to dozens of videos, some of them how you describe. kzbin.info/aero/PLb3bvZgbH92-y9LGItkUD9O2fFo3-gtVl

[@chuckbrewington6817]

I bought the Thunder torques for my 09 FLHR. The machine has minor upgrades such as tuner, gear drive cam , big bore kit and a DK air filter. The TT seemed to make more power but had a irritating flat spot at mid range and even with my complete V&H duals with the header pipe, the drone for long distance was unacceptable. I'll run them without baffles when I need to piss off the neighbors. Love most your products. This one just isn't a favorite. Spending a few hundred tuning it out on the dyno isn't worth the trouble.

[@DKCustomProducts]

Thanks man, appreciate your business and glad you are enjoying our parts. Yeah, for loud pipes these are good...can achieve the same results...faster exhaust gas velocity with the SuperTrapp type mufflers...very quiet.

[@boomdawg56]

It would be interesting to see a dyno run with exhaust and a run with exhaust removed side by side. I have an older friend who did a lot of dirt track racing, he would build an engine and install it, paint the pipes with a spray can, then go run the hell out of it for 15 or 20 minutes. Where the paint quit burning, he would cut the pipe off. Said that was all the pipe he needed. I can't say that I totally agree with you or that I disagree, my opinion is that this could be the start of a series of videos that could last for years. When you change the exhaust, bigger leg pipes, more or less restrictive mufflers, etc., you also need to change jetting because the amount of gasses going out the pipe changes the amount of air and fuel coming in. Are you going to turn this video into a science project? I would watch more.

[@DKCustomProducts]

It was a science project for about 2 years....that was before we were doing any videos. Hundreds of hours were spent try dozens and dozens of different designs....ON THEY DYNO. When we hit the sweet spot, we patented the design, published dyno charts, and they have been on our website for 10+ years. You can see them at the link below. There are now tens of thousands of folks that have used them, many of them sharing their experience, and some their dyno charts, all over the web, including here on youtube. This was before we were doing videos. However, now that we are into the video thing, we will be doing some videos later this year. Results will be the same as the charts already published....but it will be nice/fun to have the videos showing the before and afters. www.dkcustomproducts.com/thunder-torque-inserts-c57-241.htm And some of the charts are in this video- starting around the 50 second mark- kzbin.info/www/bejne/nWO5c2Okd6ubirM

[@300shields]

Just got educated. What about long pipes vs shorter pipes? I have a 2017 heritage and looking to do the bigshots. Looking g at the long and the staggered. Thank you.

[@DKCustomProducts]

Long pipes work just fine, as long as they don't have multiple steps getting bigger and bigger as they get closer to the exit end. On the Bigshots, long and staggered, they will both work fine with no inherent loss of power due to pipe length. Using Thunder Torque Inserts™ (seen in link below) with or without the baffles installed will increase your low and mid range power. www.dkcustomproducts.com/thunder-torque-inserts-c57-339.htm Here is a video with more info on the TTI's and why/how they work. www.dkcustomproducts.com/thunder-torque-inserts-c57-339.htm Always feel free to email or call with any questions: [e-mail] 662-252-8828

[@haroldwiser2641]

I recently installed TTI's on my 08 Heritage with Cobra slash cut slip-ons. They mellowed out the exhaust note by removing the raspy sound and it has much more pull at low RPM's now too. I also have a DK performance A/C with their EBS. My bike runs great!! 👍

[@DKCustomProducts]

Harold, Thanks for the comment, and your business. We appreciate it. Great to hear you are enjoying the benefits of the TTI. Ride Free!

[@davidfrench9675]

Hi, i just installed the thunder torqs on my 2022 Heritage Classic, I have Neighbor Haters and though they sounded low rumble tone. I was getting some back popping after I installed a V02 Air Cleaner. But since taking the baffles out and and installing thunder torqs, I noticed right off the bat, Better throttle response, Definately louder. actually kinda like a hollow sound though. But my bike seems to shift better and and hold idle better. When i was doing 68 in 6th gear it was purring. Im sure i need a tune now since more air in and more air out. But it would have been nice to do a Dyno comparison of before and after. All i know is my bike totally feels like it runs better.

[@DKCustomProducts]

Glad you are enjoying your ride and the improved low and mid range throttle response!

[@davidfrench9675]

@@DKCustomProducts Hey have you guys made a ied for the newer bikes yet like 2022

[@DKCustomProducts]

@@davidfrench9675 We have not, and as long as HD keeps using a good OEM tune in them, we do not see the need. Here are a couple of videos you may find interesting- kzbin.info/www/bejne/gpPCZmqQlK6jo9U kzbin.info/www/bejne/f5DHm3WPjr6oaJo

[@justingillette8287]

I believe that its often called scavenging, the reason that valve opening overlap adds power is the same concept relating to exhaust piping and the back pressure concepts. So first off, I believe that back pressure is a miss used term. the configuration of an exhaust pipe, the same way an intake effects the power curve has to to with the flow and resonance of the plumbing. these concepts can be easily discussed with examples, take any carbureted engine, if you increase the carb inlet dia you increase the peak power potential of that engine but the low end torque/power suffers, this is because a smaller dia carb is more efficient at flowing air at a lower volume aka lower engine revs than a large dia carb is. a small dia carb struggles to flow large quantities at high velocity or when the engine is at high revs this is a no brainer, this example illustrates some of the flow characteristics of engine plumbing, a similar thing happens with the exhaust as related to achieving efficiency depending on the rate or velocity of the exhaust flow, now i exceed my expertise quickly here, for both the exhaust dia and length, longer length or smaller dia typically constitutes a better low flow efficiency and thus better low end power output, and a shorter length exhaust or larger dia exhaust seems to typically decrease low end power suggesting an efficiency decrease at lower flow conditions but produces more power higher up the rev range where more flow is permitted by the more open exhaust system, this is all true in theory, in actual application however it takes more math or experimentation than I have resources for to calculate exactly the best intake/exhaust/valve cam/fuel mapping configurations for max power. there are many trick that can help the situation, Buell Xb12 motorcycles had an exhaust valve to allow switching between a long exhaust length and a shorter one look it up, i had a 2016 Suzuki GSX-S1000 that had an exhaust valve for a similar reason. Short answer: Its complicated!

[@DKCustomProducts]

There is no doubt that exhaust is complicated....no way to address the entire subject in one video. ALSO, the vast majority of Harley owners are not interested in the endless details. There is one main component, that is easily addressed, regarding getting more power out of our Harley's... Increase exhaust gas velocity. This is easily addressed by reducing backpressure and reversion....something every Harley owner can do for less than $75

[@justingillette8287]

@@DKCustomProducts Increase exhaust gas velocity, could not have said it better!!!

[@scottle2702]

Just a quick question,, have heard about back pressure all my life. Have a 97 sporty 1200 lots of modifications. Typical open drag pipes,, so with the build i went with L.A chopper vortex torque cones to try to keep some back pressure. Because of all the hear say I've heard for 30 years. So my ? Is that good or is there something better

[@DKCustomProducts]

Yeah, it is a strong myth that is out there. We have tested a variety of torque cones, we have seen no benefit (or detriment) when using them. This is seat of the pants and on a dyno. The video below shows what will increase power, mpg and a little bit of cooling...all for under $50. kzbin.info/www/bejne/mGPQf2qij5Z2gtk

[@mikepalmer5158]

Do you have a video on adjusting the thunder torque inserts thanks

[@DKCustomProducts]

95% of the time they are straight, and if you want to turn them at an angle, loosen the nut, turn it to the desired angle, tighten the nut. Here is an installation video showing how to adjust, hold in place, etc. kzbin.info/www/bejne/fJPWgXeQg85okNk

[@christianmaravelias231]

Thanks, very informative. But isn't the TT's just a minimalistic type of baffle? It must create some level of back pressure as well, does it not? If that is the case, then it's just a question of it being better than regular baffles?

[@DKCustomProducts]

No, it is not a type of baffle. The patented design of the Thunder Torque Inserts™ actually speed up exhaust gas velocity. This is the opposite of what a baffle does, which is to slow down exhaust gas velocity. Here is a report, with diagrams, showing how the TTI's increase EGV, & reduce reversion- www.dkcustomproducts.com/harley-exhaust-myths-and-facts.htm

[@Schwarzcustompainting]

I have a 19 Tri Glide with Cobra 909 mufflers. If I put in the Thunder Torque inserts does best performance happen with/without baffles? Thanks Mike

[@DKCustomProducts]

That would be a personal preference. It will be louder with the baffles removed but also slightly better for performance. The performance difference is very small so I always recommend making that choice based on the sound. Keep in mind the TTI will resonate a deeper tone so removing the baffles will be louder... but paired with the TTI it will be slightly lower sound but still pretty loud without the baffles. Please feel free to contact us with any questions or concerns; [e-mail] 662-252-8828 Thanks for commenting! 👍😎👍MB

[@noname-jr1vo]

As a Harley tech I concur. Harleys don't need back pressure. But what they do need at very least is $5800 in performance parts to make that big heavy bish actually go somewhere with any kind of expediency or what I would consider an acceptable amount of power to make the bike fun to ride. Put pipes on it and it will sound like a dragster and go and handle like a Dodge caravan. Hell yeah guys. Time to bust out the old sandals, cargo shorts and the novelty brain bucket helmets. 👍

[@DKCustomProducts]

Interesting perspective.

[@NoXQc]

Would you add a TTI With a baffle ? Or gotta straight pipe it through and put the TTI? Some exhaust doesn’t sound really good without baffles

[@DKCustomProducts]

With straight thru baffles the TTI will work great...they do not need to be removed to get the benefits.

[@fredlambert323]

Just curious I just put new S@S slip ons and air cleaner on my new RG3 also a Screaming Eagle tuner . Was really dissappointed with the sound. Been riding since 1966 so I pulled the DB limiters out. Baffles still in. Did I scew up the tune?

[@DKCustomProducts]

Your tune will be fine. It may pop a little but this is not indicative of an issue with the tune, just the nature of a free flowing exhaust. You may want to look at getting some thunder torques for your exhaust to help with low to mid range torque, sound and decel pop. You can see a video on the thunder torques at this link - kzbin.info/www/bejne/mGPQf2qij5Z2gtk Thank you for commenting! 😎

[@kenbruno8774]

I have tab 50 cal exhaust. Do you think I would be ok pulling the baffles and putting the tab torque cones in. Would I keep the power

[@DKCustomProducts]

You can certainly do that. What you will be left with is a wide open, roughly 4" diameter slip-on. Very similar to a baffle-less OEM exhaust as seen here .... kzbin.info/www/bejne/enzEkpp9jd2IsMk go with these 258 series TTI - www.dkcustomproducts.com/thunder-torque-inserts-258-model-family-dk-tti-258.htm I think you will be pleasantly surprised and happy with your low - mid range torque increase.

[@GeemailMailboxx]

Should I have to fart something fierce, I am definitely not looking to have any reversion, therefore I wear thicker underwear, thus creating a Thunder torque effect. 🤓👍

[@DKCustomProducts]

Good planning! 🤓👍

[@peckharris3180]

Do You Have A PHD IN FARTING. 🧐🧐👍😂😂😂

[@freddymuniz514]

Dude I laughed for twenty minutes straight! 👍🏼👍🏼👍🏼👍🏼

[@GeemailMailboxx]

@@freddymuniz514 🤣👍

[@DKCustomProducts]

@@freddymuniz514 👍👍👍👍

[@Heavy69Metal]

Instead of making it I’m going to use a W258 so how far back if I drill a hole into the 2.5” baffle from a 2:1 D&D Billet Cat With a Big Bore Baffle. I’m debating keep baffle and do below with the Thunder Torque vs no baffle but thinking of 45° versus flat open over hole covering it as shown in your videos what’s your take on it. Also thinking of taking all the wrap off of it there’s two wraps the thick ones and a finer one not sure taking both off or just the one thicker one. Enjoying a whole about 1 inch in on the baffle and And installing the W258 In probably 45° angle with the back facing upwards angle. Your thoughts STEP 1: We recommend purchasing a 1/4"x1" thumb screw which can readily purchased at any local hardware store for about $ 0.50 a piece. They work great. The "football" shaped head on the screws measure approximately 3/4" x 1/2" so they have about the same surface area as the 3/4" O.D. washer because of the lack of the hole. And they do not require any fabrication. Alternatively you can take a 3/4" outside diameter washer and weld it to the top of a 3/4" x 1/4" bolt. STEP 2: Drill a 1/4" hole about 1" inside your head pipe where your aftermarket exhaust slip on. STEP 3: Take the tunable baffle and place a 1/4" nut and a lock washer (away from the large washer). Now insert your tunable baffle into the exhaust pipe like the example below. You can tune the baffle by changing the angle of the thumbscrew or washer to the exhaust pipe. For maximum torque, the washer will be at 90 degree angle to the pipe. For maximum horsepower the washer will be parallel to the pipe. In a study given to Bike Tech by Gene P. Three runs were done. Run 5 was done with the thumbscrew 90 degrees to the pipe or perpendicular, Run 6 was done at a 45 degree angle and Run 7 was done parallel to the pipe. Run 5: Had the lowest horsepower, but the 2500-4000 RPM power was the highest. This is the RPM band that most riders spend their time riding. Run 6: Improves the 3000-4000 RPM horsepower drop over run 7 without any significant drop in maximum power. Run 7: Makes the most power, but has a huge hole in the power band just above 3000 RPMs. Since the thumbscrew is parallel to the pipe in this case, it has a very small profile and would be very similar to it not being there at all. The information for this article was gathered from nightrider.com's Bike Tech.

[@69Busa08Nova]

it’d be interesting to hear a technical explanation of how/why your TTI’s work.

[@kevingleason5434]

kzbin.info/www/bejne/nWO5c2Okd6ubirM

[@DKCustomProducts]

The video Kevin Gleason mentions, around the 5:25 mark is a good explanation. Also, you can see a written one at this link- www.dkcustomproducts.com/harley-exhaust-myths-and-facts.htm Video link at 5:25 kzbin.info/www/bejne/nWO5c2Okd6ubirM

[@69Busa08Nova]

Cool, thanks

[@gentrydebbie1040]

Iso many Harley mags said you have to have back pressure, So I took my exhaust off and put forcing cones in them I could not hear feel see any difference so I took them out my wife demands Fishtails I agree I did not have access to a dyne back then ? But with the newer Bike she is running a 2 into one full exhaust with no baffle? I do believe in running the breather bolts into a tee and chrome Gas Filter.

[@DKCustomProducts]

Nor quite following what you are saying...but it seems like you have a 2-1 exhaust with no baffle. Put a TTI in there and you will enjoy even more low and mid range torque.

[@zenpro8164]

can you guys do a video testing with a dyno on a stock exhaust with baffle, a stock exhaust without baffle, then finally with your insert installed...lets see some dyno results

[@DKCustomProducts]

We did that years ago...many charts are posted in this link- www.dkcustomproducts.com/thunder-torque-inserts-c57-241.htm And in this video- kzbin.info/www/bejne/nWO5c2Okd6ubirM This was before we got into making videos. So we will be doing more dyno runs later this year and videoing the process.

[@timconnors550]

That's like harley told me external breathers were bad for harleys and I am one of the first to put one on my streetbob and after installing I put it out on the internet and it exploded. They are everywhere and everybody is making their version. So use your own judgment and knowledge. My dad taught us that an engine needs three things to make power clean cool air good Clean fuel and good spark. BOOM. My bob does better than ever. Performance mileage and wear and tear on my drive train.its a no brainer to think for myself knowing all the professionals like to listen to the manufacturers. They treat you like a mushroom. Feed you shit and watch you grow. Into one of them. Think for yourself and make informed decisions. It will never fail you

[@aussie_xsf]

I would have to agree with you, after much research I fitted my Road King with an external breather, no more oily fumes going into the combustion chamber, just air, fuel and spark. Is there a huge difference in performance ? No, not that I can feel, but it sure wont hurt your motor, just puts less carbon deposits into it. You dont need expensive air cleaners and stuff, either, because your motor will only flow as much air as it is able to in its current configuration, so just get a high flow element and save your bucks... My 2 cents worth, anyhow.

[@DKCustomProducts]

Some good info there. Thanks! 👍

[@karlhicks1838]

Do you need to leave the baffle installed and put the proper thunder torque insert in the baffle or take the baffle out and use a larger proper thunder torque incert

[@DKCustomProducts]

You will get the most power by removing the baffle and using the proper size TTI. However, it will be much louder. If it is stock exhaust, the TTI's do no good with the baffle in. If it is aftermarket exhaust, with a straight thru baffle, If you leave the baffle in, and use the appropriate size TTI you will get a boost in power, just not quite as much...and it will not make it louder, just a bit deeper sounding than it is with just the baffle.

[@patrickpaglia1383]

I ordered the TTIs and EBS for my stock still under warranty street Bob. I removed the baffles and put in the TTIs in the stock pipes and added the EBS to the stock air cleaner. Should I still install a crank case breather(dip stick)?

[@DKCustomProducts]

Awesome! I hope you are enjoying the benefits of having the parts installed. Vented dipsticks and transmission cover vents do NOT take the place of external breather systems. There is still hot, oily, oxygen depleted air being fed into the intake. The folks that sell vented dipsticks and trans cover vents, have it right in their product description that they do not prevent all that crap from going into your intake. Here is a copy and paste from the Trask website- "This will reduce the oil exiting from the head breathers..." Even if there is no trace of oil in the intake, there is still hot, oxygen depleted air going into the combustion chambers, making the engine run hotter, and not as strong because of the lower oxygen content. IF you have an older M8, with the older oil pump and you are concerned about sumping...OR, IF you have a built engine with higher compression, then it may be beneficial to do an EBS And a vented dipstick or trans cover vent. Here is a video that shows more useful information on External Breather Systems- kzbin.info/www/bejne/e5enlnmQl9GAmc0 Please feel free to contact for any questions; [e-mail] 662-252-8828 Thank you for your business and for commenting! MB

[@jameslleary]

I think people are being confused by the “Plug” in a quiet Baffle. We still have open and perforated “Baffles”, the best being stage spiral type in my opinion, that are still open and can be seen through.

[@DKCustomProducts]

Good Perspective! Here is a video with more dets on the TTI's- kzbin.info/www/bejne/mGPQf2qij5Z2gtk Also, here is a written report with more info- www.dkcustomproducts.com/harley-exhaust-myths-and-facts.htm Thanks for your comment and for watching!

[@clubstyleridahd4695]

Whats the optimum size baffle for a built sportster? I have a s&s superstreet 2-1 it has a 1.75 inch reducer at the end of the muffler. Will going to a 2 inch reducer give me more power?

[@DKCustomProducts]

The optimum is no baffle or reducer. So if you do have to use one for some reason, the larger the better. Here is a video that you may find very interesting regarding exhaust sizing and the relationship between that and power generated. kzbin.info/www/bejne/ameapamDbadrkJo

[@eddiealvarez5493]

So that being said, one can remove the baffles from the stock pipes on a 2020 Road Glide and add the torqks? And that will work fine?

[@DKCustomProducts]

That is correct. And those stock slip-ons, with the baffles removed and the Thunder Torque Inserts™ installed will perform better than 99% of the expensive aftermarket slip-ons being sold. You can read some of the reviews at this link- www.dkcustomproducts.com/thunder-torque-inserts-258-model-family-dk-tti-258.htm Also, here is a short vid of an M8 with baffles removed and TTI's installed- kzbin.info/www/bejne/enzEkpp9jd2IsMk

[@TheJasinator]

I just ordered TTIs for my Harley. My question is since I removed the baffles from my slip-ons I have this awesome popping when I come off throttle, am I going to lose that sound? Lol

[@DKCustomProducts]

It may reduce it a bit. Popping is all about the AFR in the exhaust, and with the TTI's it does change the air flow in the exhaust, so it can have an effect.

[@hhplymouth9473]

I agree back pressure is not good. I do think baffles are good. I would rather sacrifice some power and have a quiet motorcycle.I think there's just as big a myth that says you have to have a loud motorcycle to make horsepower. There are plenty of stock motorcycles making well over 100 hp that are quiet.

[@DKCustomProducts]

Thank you for the comment, you bring up some really good points.👍 Backpressure robs power. This is indisputable. Using TTI's in an open pipe is annoying loud for some folks this is indisputable. The myth that loud pipes make more power is indisputable. The SuperTrapp style mufflers are quiet AND reduce backpressure and reversion, resulting in faster exhaust gas velocity...which means more power. Most bikes that are quiet, making over 100 hp would make even more with either of the above two set ups.

[@InHimwillitrust]

So if I were to circle drill the baffles on my RGS out, could I then replace them with the thunder torks? Sounds pretty simple.

[@DKCustomProducts]

Yes, it is that simple. Here are a couple of videos to give you an idea- kzbin.info/www/bejne/enzEkpp9jd2IsMk kzbin.info/www/bejne/qoCwemavd9-Sb9k kzbin.info/www/bejne/faasmH5jp8hlqZY

[@klownsho1]

My opinion back pressure allows cat to do its job better. Me no like got 2020 breakout 114 with Blow performance exhaust and hd extreme flow intake air filter with tune ant love the sound and performance with no baffles

[@DKCustomProducts]

Glad you're liking your set up. I am willing to bet you will like it even better if you throw some TTI's in the mix.

[@chesta-dacheetaa8754]

Wanting to Taking baffles out ,what about the cat,can it stay in?-,, stock 2019 roadking STANDARD 107,,,,great channel ya,ll-!!

[@DKCustomProducts]

Thanks, glad you're enjoying. They work great with the cat in or the cat removed. Has no perceptible effect either way.

[@micahtorres3414]

I have a 2020 softtail, with S&S 2 into 1 exhaust stage 2 kit. I removed the cat material from the mufler and now have torque loss. Will this torque insert help me?

[@DKCustomProducts]

Absolutely. The Thunder Torque Insert™ will reduce the reversion, resulting in faster exhaust gas velocity. Practical outcome is an increase in torque in the low and mid range RPM's.

[@malcolmvuksich8985]

I have a 2021 road glide limited. I want to remove the stock baffles. What size thunder torque inserts do I need.

[@DKCustomProducts]

a 258 is what we have used. Here is a link to a chart for you to verify for your particular exhaust. www.dkcustomproducts.com/choosing-the-right-size-thunder-torque-inserts.htm