Harley Exhaust, Deeper Tone & More Power-Under $50

Easy Installation of Patented Thunder Torque Inserts™ Deliver a Deeper Exhaust Note, Plus an Increase in Low & Mid-Range Power That You Can Feel When Riding.
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💥 Link To VIDEO of Different Sounds from pipes with TTI's- • DK Custom Improved Sto...
💥 Link To VIDEO of How Exhaust can Heat up or Cool Down Your Harley- • HD Exhaust-It can Heat...
💥 Link To VIDEO of M8 Road Glide w/ TTI's in Stock Exhaust- • Converting Stock Harle...
💥 Link To VIDEO of a Great Sounding Sportster w/ TTI's - • Converting Stock Harle...
💥 Thunder Torque Video Playlist - • DK Custom Thunder Torq...
✅Thunder Torque Inserts™ Fitment Page - www.dkcustompro...
✅Harley Exhaust, Myths & Facts - www.dkcustompro...
✅Thunder Torque Inserts™ Product Page - www.dkcustompro...
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The DK Team

[@GixxerFoo]

Those do make a difference in sound, Sportsters tend to have a higher pitch but that gives it a much deeper tone. Can't beat the horsepower and torque gains either, that's some really inexpensive power!

[@DKCustomProducts]

Yeah, depending on the bike and which exhaust it can really make a huge improvement in low and mid range torque. Thanks for the comment. 👍

[@clubstyleridahd4695]

What about on a 2-1 exhaust, have you had any experience with them on a 2-1 or heard anything about it? Thanks!

[@RayfordRaySiegel]

Hey, GixxerFoo. It's interesting seeing you here, and it's good to see your confirmation about these. I'm getting some for my new 2003 Sportster that I already love the sound of, with the stock pipes. It doesn't go, like my other Sporty that has drag pipes. Maybe this can close that gap, a little, between the two.

[@JohnWarner-lu8rq]

I'd have to see the results on a dyno in person, or a non-edited video.

[@hughkaplan5128]

Installed the 2 in inserts on my 05 fat boy it's not tuned to the vance and heinz exhaust. Got better response on all gears. I installed the inserts on the exhaust tips. They had enough room to install the inserts without taking the exhaust pipes off. I am very pleased with the out come. I left the baffles on because it was already loud.

[@DKCustomProducts]

That's great! Glad you are enjoying the improved power. 👍😎👍 We appreciate the report and your business. Thank you!

[@rodneyjeanes2633]

I installed the Thunder torque inserts into my Vance & Hines Titan slip ons after removing the baffles. Wow! Deeper tone and I can feel the torque difference!! I recommend these to everyone I know.

[@DKCustomProducts]

Thanks! Glad you like them!

[@siteq1]

Just installed the 258! OMG! It's the sound I've been dreaming of! 4" V&H...didn't need to tune AT ALL! running previous maps and sounds absolutely AMAZING! 💯👍🏾💪🏾🤙🏾❤️

[@DKCustomProducts]

Right on! Glad you are digging the sound, appreciate your business and comment. 👍

[@frankensteinrules6511]

I had basically the same thing in 1968 on my 305 Honda scrambler, to quiet it down some after I cut the muffler off.

[@DKCustomProducts]

Yep, lollipops have been around for well over half a century. These are an evolution of them, but same principle.

[@dustinranck7388]

Very cool. I’ve seen folks fabricate something similar to these for their non Harley racing motorcycles going way way back. Always thought it made a lot of sense and nice to see you guys implementing these for our bikes. Great workshop too and thanks for the videos. Great stuff. 🤘

[@DKCustomProducts]

Thank you for the kind words. Glad you are finding the videos useful/interesting. Yes, we used bolts and washers in the exhaust going back over 50 years. About 10 years ago we knuckled under and worked on dozens of variations, trying to improve it. Finally came up with the best version and got it patented.

[@dustinranck7388]

@@DKCustomProducts Looks like ya got it sorted and what a great addition to our bikes. Well done on the R&D. That’s impressive and not a easy endeavor. Thanks for all the hard work. Anyone these days with a CNC or the ability to small batch manufacturer parts is churning out un-tested and un-verified results / parts which usually have zero performance gains, or are actually detrimental to our bikes. Thanks for taking all the time to develop ideas and sharing those results publicly. 🤘

[@DKCustomProducts]

Thank you, appreciate it very much! 👍

[@markpatrick7072]

I have a 2012 FLHTK with a Vance and Hines Pro Pipe with the standard baffle . A little to loud . I was thinking of adding the 258 Thunder Torque insert to the pipe with the baffle . It looks like it may be a job drilling a new hole and getting the Torque insert into the pipe .

[@DKCustomProducts]

Yes, we have had more than a few Customers use the TTI's in the Pro-Pipe. Need to get a coupler nut and a stud to get it to reach. Not sure if the 258 will fit with the baffle. Might have to go with a 158. Here is a link to a chart so that you can double check the sizing. www.dkcustomproducts.com/choosing-the-right-size-thunder-torque-inserts.htm

[@garywheeler1812]

I’m after for the performance and lifelong time of the bike not the sound. I all ways was told to Open it Up: Free Flow! No Restrictions!

[@DKCustomProducts]

That is correct. You want the most free flowing possible, with no reversion. You may find this video interesting- kzbin.info/www/bejne/pqOZq2NmnLFoj8k

[@thomascarpenter7415]

Awesome demonstration and explanation ! I support the little guys, you’re getting my business when possible ! 😎🇺🇸

[@DKCustomProducts]

Thank you, we appreciate that! 👍😎👍

[@pauldersch6936]

I ordered the Thunder Torque inserts for my HD 103 with Shark Road 4" mufflers. Right off after drilling the first hole, I noticed the studs were TOO SHORT to go through the muffler. Couldn't get the flat washer, lock washer and the nut on at all. Their was only enough room for the nut. I know that wasn't gonna work. The installation was NOT the same as the DK video, simple and easy...lol. I was gonna give Kevin a call to see what was WRONG. Instead I went back on line to view a few more videos to see if anyone else had this problem. Luckily, I came across a video by Night King on his M8 2020 Road King Special. It solved my problem. I won't go into his video, just go check it out.. It might have made it a little easier install if the studs were just about a 1/2" to 3/4" longer...

[@DKCustomProducts]

Yes, as noted in the instructions, some pipes will need a coupler nut to lengthen the stud. HOWEVER, we recently came out with longer stud options for those with bigger diameter pipes. You can see a video on them at this link- kzbin.info/www/bejne/pJLUgad7mKmWi5I This variation does away with the need for a coupler nut, or any other modifications for the larger diameter slip-ons.

[@pauldersch6936]

@@DKCustomProducts with all that said and done. It would have been useful to have seen the aforementioned video also. But, ALL is good, no harm done. Keep up the GREAT work...

[@DKCustomProducts]

@@pauldersch6936 Thanks man, appreciate that. btw, subscribe to our channel, and hit the notification bell, then you will get notified whenever we publish a new video.

[@pauldersch6936]

@@DKCustomProducts been their ALREADY done that. Look'en forward to MORE videos..

[@DKCustomProducts]

@@pauldersch6936 Awesome, thanks for watching!

[@jaybales3160]

I like the sound. Plan on doing this. Thank you.

[@DKCustomProducts]

Cool, thanks for the business, I believe you will be well pleased with them. 👍

[@georgeparker7108]

Thanks for the information, keep up with the great work guys.

[@DKCustomProducts]

Thanks, will do!

[@tellawcaster]

I have a sportster 48 with a stage IV and VH shortshots and feel compelled to comment as these are one of the best purchases I’ve made for the bike. I took out the baffles and put in the TTI which took all of 30 minutes. They make the bike better, full stop. There’s no other way to put it. I don’t understand the physics of it and don’t want to know. These things cost next to nothing and have been one of the best mods I’ve done to the bike.

[@DKCustomProducts]

Thank you for the review. 👍 It is always great to hear how the TTI's are helping bikes run stronger. 😀🏍

[@bajarvcouple]

Increased power and they sound great!

[@DKCustomProducts]

👍

[@BUBS_HD]

Likes was at 999 I'll give ya number 1000👍

[@DKCustomProducts]

Thank you for your comment and like!

[@talkingrock7011]

Definitely a better exhaust note ! thanks I’ve been thinking about putting some in my Reinhart DBX mufflers since it’s a 131 with the Jackpot XXX header

[@DKCustomProducts]

I believe you will be pleasantly surprised with them. 👍

[@ralphmills6535]

talkingrock7011 did you do it. I have the DBX also. How did it turn out? I'm considering removing the baffles and using the larger TTI's.

[@darrenschneider9722]

I love all my Dk customs products

[@DKCustomProducts]

Thank you! 👍

[@rubberhead3520]

I agree

[@Znd93Rus]

It could have any positive effect only if ypur exhaust isnt optimal for your engine. In case that most aftermarket exhaust systems is first of all for sound this product can be useful.

[@DKCustomProducts]

You may find this video interesting about exhaust myths regarding Harley-Davidsons- kzbin.info/www/bejne/pqOZq2NmnLFoj8k

[@Znd93Rus]

@@DKCustomProducts Ill check it, thanks.

[@jackklarich7045]

Good video and great product, much better than old school lollipops. I am a big fan of double nutting exhaust parts, I have had trouble in the past with baffles coming loose

[@DKCustomProducts]

Great point! Thanks Jack!

[@ryanphillips3533]

Any m8 114 experiences on here? Got stock pipes all around but I have taken the baffles out entirely and the sound is OK for me for now but I was considering deleting the cat. If I can do that and use these things to keep from losing any power plus get the sound I'm looking for without paying 4 to 900 bucks for slip ons only then that makes more sense to me!

[@DKCustomProducts]

I'm running them on my 2019 M8 114. Whether you leave the cat or take it out, these will give you a deeper tone and increase low and mid range power by a nice bump. Here's a video of when I first gutted the baffles and installed them- kzbin.info/www/bejne/mYDWYmCYibWsmbc Then, these are the same slip-ons on my 2019 114- kzbin.info/www/bejne/r3rFon1trtmladk

[@robfiumara7935]

I would like to see the Dyna dyno charts with the only change being the thunder torque inserts. To me, the high flow air cleaner is making the power. Not the thunder torque inserts... Touring bikes are a while different animal

[@DKCustomProducts]

No doubt that a good high flow air cleaner will make an improvement also, but we have many charts where the only change made was the addition of the TTI's. Here is a link to one of them- www.dkcustomproducts.com/media/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/t/d/td-tdtti.jpg The above is showing that JUST ADDING THE TTI's gave a 4.5% and 6.5% increase. And you can see more at this link- www.dkcustomproducts.com/thunder-torque-inserts-118-model-family-dk-tti-118.htm And you can see even more in the videos in this playlist- kzbin.info/aero/PLb3bvZgbH92-y9LGItkUD9O2fFo3-gtVl

[@oldasdihrt5993]

D'ya think that it would be possible to put them into sharkroad fishtails with the tamperproof baffles? Like with long needle nose pliers or whatever.

[@DKCustomProducts]

I've never heard of Sharkroad, nor of tamperproof baffles. So I went to the Sharkroad website. Appears to be a Chinese knock off company. Here is what they say about baffles - 5. Do these mufflers have a baffle inside? Yes. You can remove them if you require for a louder sound. The manual instruction on how to remove the baffle comes with the exhausts. Of course, with the knock-off companies, and when english is not their first language, it is difficult to know if what they say is accurate on their website. If their site can be trusted, then whatever process gives you access to remove the baffle, that same process will give you easy ability to install the TTI's. If it is not accurate...there is no way to get into the tail end of the round pipe, right before the fishtail...You may be able to slip the TTI in there with some long needle nose. We have never done it, but it may work.

[@RayfordRaySiegel]

Nice! I was gonna get some bolts to put in my stock pipes, but now I'm getting some of those. I was just looking on the site. I didn't know that there are different ones. I don't know the size of my exhaust; I'll measure it, but if my slip-on pipes are 3 inches, then it seems like it's settled, on which one to get, but if my slip-on pipes are 2 inches, I guess I could go with the ones made for either. I have a 2003 Sportster 883 Custom. I don't know if there are other factors in getting the torque inserts.

[@DKCustomProducts]

The following link has more info on fitment- www.dkcustomproducts.com/choosing-the-right-size-thunder-torque-inserts.htm Feel free to email or call with any questions. [e-mail] 662-252-8828

[@TheMakarov9]

Will I get better torque and deeper tone with the baffles in and the thunder torque inserts or pull the baffles and install the thunder torque inserts? I have a 2007 Sportster 1200 with the Screamin Eagle Slipons What size Thunder Torque inserts will I need for the Screamin Eagle slipons?

[@DKCustomProducts]

You'll get better torque with the baffles pulled. Tone is subjective, it will be quieter with the baffles in. Use the 118's if you leave the baffles in and 158's if you take them out. Here's a little video with a bunch of sound clips that you may find useful- kzbin.info/www/bejne/faasmH5jp8hlqZY

[@mrnonpc9885]

Since you were using a decibel meter in the video it would have been more informative if you shared the before, and after decibel readings.

[@DKCustomProducts]

You can see the decibel charts on the TTI product page at this link - www.dkcustomproducts.com/thunder-torque-inserts-c57.htm Thank you for commenting! MB

[@stevenmiddlebrook5756]

Thank you

[@DKCustomProducts]

👍

[@joejunior1974]

Seems like it would be important to place them at the correct distance from the end of your pipe. Have you done tests to see where the optimal distance is?

[@DKCustomProducts]

Yes, we have done extensive testing on this and 1/2" to 2" from the exit end of the mufflers is best. If necessary, up to 3" from the end, but more than that and the benefits start dropping. Here is a link to the instructions that talk about that- www.dkcustomproducts.com/media/wysiwyg/exhaust/tti/11-6-19_Thunder_Torque_installation_instructions.pdf And here is a link to a playlist of MANY (52) videos on the TTI's- kzbin.info/aero/PLb3bvZgbH92-y9LGItkUD9O2fFo3-gtVl

[@joejunior1974]

@@DKCustomProducts thanks for answering my question. I'm ordering some for my street bob.

[@DKCustomProducts]

@@joejunior1974 Awesome, we appreciate your business & support!

[@edwardmarin-8pqb141]

Good Video I put some Sharkroad slip ons on my 2023 SG Special they sound ok, but not the old school sound that I was used to with the fishtails on my old bike. ? is, can I do this with slip ons or do I need to put the stock pipes on. stock sounded like a moth fartin in the wind (EPA crap) The Sharkroad sound ok a little more roar but still not what I wanted. Can't return them so perhaps improve them

[@DKCustomProducts]

Thank you. If you want louder, and more power, pull the baffles out and put the 258 TTI's in. www.dkcustomproducts.com/thunder-torque-inserts-258-model-family-dk-tti-258.htm Feel free to email or call with any questions. [e-mail] 662-252-8828

[@killdozer3464]

just ordered the 158's to install on my slipons on my 2007 softail custom. Also ordered the Outlaw 587, and exhaust wrap. I already installed the VIED on the bike (its the first thing I do to every twin cam I purchase.) During the off-season I am going to install cams, a 2-into-1 exhaust (any recommendations?), an a tuner.

[@DKCustomProducts]

Thank you for your business, we appreciate it. I believe you care going to like the benefits of those parts you have coming your way. For a 2-1 exhaust, I would look at the Thunderheader, the D&D's, the SuperTrapp (if you like quieter) or the Bassini Road Rage (we've had a lot of Customers really like that one). The best way to know which exhaust you'd like is in this video- kzbin.info/www/bejne/fmebYpeiZ72SnJY

[@jordi_casas]

I understand the TTI works better with straight pipes..if I remove the mufflers and add the the TTI ..would the sound volume increase??

[@DKCustomProducts]

If you remove the muffler and install the TTI into the Head pipe you will see a huge decrease in performance and large increase in volume. If you are only looking for sound then that will work for you, but if you are looking for performance this will not be the way to go. Here is a video on exhaust that you may find useful- kzbin.info/www/bejne/pqOZq2NmnLFoj8k Here is a written report on how exhaust works that you may also find useful/interesting- www.dkcustomproducts.com/harley-exhaust-myths-and-facts.htm Please feel free to contact us with any questions you might have; [e-mail] 662-252-8828 Thanks for commenting! 👍😎👍

[@Jeffmd2020]

Will these work on a street glide with V&H big radius 2 into 2? And do I have to take the baffles out?? And also, how beneficial or harmful is it to remove the baffles from your exhaust with a tuner that has a “no baffle” option?

[@DKCustomProducts]

Yes, the TTI's work exceptionally well with V&H exhaust. Taking the baffles out will give more power, but even with the baffles in, you will get a nice bump in low and mid range power. There is no harm in removing the baffles, other than a decrease in power unless you use something like the TTI's. I believe you will find this video very useful/interesting- kzbin.info/www/bejne/pqOZq2NmnLFoj8k

[@shaneflutsch2270]

Ya know, I'm thinking that this applies to other types and brands of bikes. Coming from the car world, I've had many arguments with people about back pressure, I honestly don't believe back pressure helps. But doing something like this prevents reversion. I wonder on high power bikes, how much would this affect top end or not at all?

[@DKCustomProducts]

Yes, on most any gas engine, with open exhaust, these will boost low and mid range power. For engines that live primarily above 5000 rpm, these are not going to help. Below is a video showing the whys and hows of the TTI's. kzbin.info/www/bejne/pqOZq2NmnLFoj8k

[@shaneflutsch2270]

@@DKCustomProducts thanks for the reply! 👍

[@clydedettor7080]

Kevin, I noticed at 1:39 on the video that you left the baffles in the new mufflers. Will this work with stock CVO mufflers. If so I'll add it to the order I'm sending you for all the non-invasive cool down stuff. I'm trying real hard not to irritate the warranty guys. Leaving the intake and breather bypass until after my 1000 mile check up and you get the new transformer back plate out to us masses.

[@DKCustomProducts]

Yes, the owner of this bike did not want it any louder, so we left the baffles in. The baffles on this bike are straight thru, so the TTI's work with them. OEM CVO baffles are not straight thru, so there is no benefit it using the TTI's with them unless the baffles are removed. Here is a video that explains more on this subject. kzbin.info/www/bejne/pqOZq2NmnLFoj8k

[@shaunallen8902]

Hey Guys, just purchased the Thunder Torques for my 09 twin cam . Right now I’m running the Outlaw 606 with the FP3 tuner. My pipes are generic drag pipes w no baffles. So that’s the tune I installed. When I install the Thunder Torques do I need to re instal a canned tune WITH baffles or just keep auto tuning? Thanks

[@DKCustomProducts]

No need to put in a new base tune. The TTI's function very differently than baffles. Auto tune will get you there. Thank you for your business, we appreciate it. 👍😎👍

[@raybrensike42]

Today I made some lollipops with $10.00 worth of stuff from the hardware store. The bike I just bought was popping badly and I chased down some intake leaks using a good quality automotive hose clamp to seal where the carb meets the manifold and also got new intake gaskets but the thing still runs lean. So after I put in the lollipops it ran so much better, only a few pops when cold. I didn't like the change in the sound and it was louder in my ear, being the rider, though I suppose it was quieter from behind. I turned them sideways to see what would happen and it began popping again. What to learn from this? Were the lollipops restricting the exhaust? With a more free exhaust, it's not uncommon to have to jet richer. So what have I learned from this? I just turned them flat ways so I can ride this week while I wait for my bigger jets to arrive, but otherwise I could wish I wouldn't have drilled my slip on mufflers for a lollipop experiment. The change in sound alone makes anything in the exhaust a "no" for me. I will be waiting for my bigger jets as I ride with the lollipops in, as they do certainly serve a purpose at this time. After I re-jet they will be gone.

[@DKCustomProducts]

Yep, lollipops can help, but they provide no where near the benefit or improved sound quality of the patented Thunder Torque Inserts™. You can see more details and why they are so much better at this link, where we discuss how Harley Exhaust works- www.dkcustomproducts.com/harley-exhaust-myths-and-facts.htm Thanks for commenting! MB

[@maximumoverdrive2132]

So are these essentially putting necessary back pressure back in your exhaust after removing baffles?

[@DKCustomProducts]

No, the patented shape creates a Venturi Effect, speeding up the exhaust gas velocity. At the same time that it is speeding up the EGV, the cupped part is stopping the energy pulse from traveling back up the pipe. Backpressure slows down exhaust gas velocity. Back pressure robs power and heats up the engine more than needed. Here is a video on the subject- kzbin.info/www/bejne/pqOZq2NmnLFoj8k

[@davidwagner8776]

i’m thinking about removing baffles. but i’m told it will compromise power. will these resolve my problem?

[@DKCustomProducts]

Yes, these will bring back and improve the low to mid range torque that you would lose for taking out the baffles. You can see a full written report on exhaust at this link - www.dkcustomproducts.com/harley-exhaust-myths-and-facts.htm You can read more about the TTI's at this link - www.dkcustomproducts.com/catalogsearch/result/?q=thunder+torque Please feel free to contact us with any questions; [e-mail] 662-252-8828 Thank you for commenting! 😎 MB

[@michaelrao8188]

Great Video! Will these work on a 2022 Tri Glide with a Harley Stage 2 Kit? Will I need to retune? Thank you.

[@DKCustomProducts]

Yes, the will work well, increase low and mid rpm power. No need to retune. 👍

[@parkeslife4323]

Hi guys. Does it make a difference which end of the baffles the insert goes?

[@DKCustomProducts]

Yes, it makes a significant difference, You want to get as close to the exit end of the pipe as you can, when the energy pulse hits the outside atmosphere, that is when reversion occurs, which is what slows down exhaust gas velocity, which limits the intake charge, which reduces power. Here is a link to a good video explaining...it has an excerpt from S&S showing how the pulse slows down velocity, reducing power. kzbin.info/www/bejne/pqOZq2NmnLFoj8k

[@Nine_883]

Is there something special about Harley or will this work on any bike with a slip on?

[@DKCustomProducts]

They are pretty much a universal item. They can be used in all types of Open Exhaust, but we have only done testing on Harley's. Thanks for commenting! MB

[@RydinginStyle72]

What is the percentage of the area of the outlet that should be covered buy the disc? Insert? For example if you have a 2 in diameter pipe what size insert do you need? If you have a 3 inch diameter pipe and so on? There are many common pipe sizes.

[@DKCustomProducts]

If the inside diameter is less than 2", you'll need the 118, between 2-3" you'll need the 158, and anything over 3" will require the 258. Here is a write-up on Choosing the Right Size Thunder Torque Insert™- www.dkcustomproducts.com/choosing-the-right-size-thunder-torque-inserts.htm See TTI here - www.dkcustomproducts.com/thunder-torque-inserts-c57.htm

[@RydinginStyle72]

@@DKCustomProducts I appreciate you taking the time. I am going to run a 2.5 inch, so the 158 I just purchased should be perfect. Thank you again!

[@DKCustomProducts]

@@RydinginStyle72 Yep, those will be just right! We appreciate your business, let us know what you think once installed! Ride safe!

[@randallperry6774]

2000flstc. Stock exhaust with cored stock slip ons. Stock crossovers between each header. Stage one and thunder slide. I would have to drill the ends of the chrome mufflers to insert this product and would I have to rejet?

[@DKCustomProducts]

Yes, you will need to drill a hole within 2-3 inches of the end (do it on the wheel side so not as visible) and put them in there. You will not need to rejet...you might get a little extra if you do, but it is not necessary.

[@drooge42]

hey mate good vids hey you said you run the redline is that all year for your twin cam im thinking of switching heard real good things about that oil

[@DKCustomProducts]

Yes, on my Sporty, Twin Cam and M8. I run redline in all 3, year round.

[@chriswarby623]

I have fuel pack tuner will this need remapping after adding the torque inserts? I have Vance and Hines slip ons Harley 2013 Road King 103

[@DKCustomProducts]

It is not needed. You may get a tiny bit more power if you do an autotune, but, likely not enough to feel seat of the pants.

[@mattgwinner4783]

I have just gotten a 2000 carbureted twin can 88B, it has Vance and Hien's straight shouts with baffles, I love the sound but hate the backdraft Burble Gurgle every time i shift the bike. do you think these inserts will stop the jake brake effect? also i have no popping or backfiring in the exhaust.

[@DKCustomProducts]

The Thunder Torque Inserts™ will greatly reduce/possibly eliminate that sound you do not like. www.dkcustomproducts.com/thunder-torque-inserts-c57-334.htm

[@marzbarh]

I have Vance and Hines monster ovals 4.5 Will they fit my slip ons?

[@DKCustomProducts]

Yes. Here is a fitment page- www.dkcustomproducts.com/choosing-the-right-size-thunder-torque-inserts.htm

[@robertcunningham1730]

‘21 TriGlide, Stage 2 with Kromeworks slipons. Would these benefit my bike and would I need to retune afterwards?

[@DKCustomProducts]

Absolutely. You will feel an increase in power in the low and mid rpm range. No retune is needed. The ECM will adjust. Here is a link to a video on that subject that you may find interesting. kzbin.info/www/bejne/ZqfFhZ6Iq6uUbpI

[@0NEDEEP]

Hell yeah

[@DKCustomProducts]

👍

[@thewurstgarage676]

Would these work on a Shovelhead with straight pipers?

[@DKCustomProducts]

Yes, you will be pretty surprised at how much power it will add in the low and mid range RPM. Your set up will respond particularly well. 👍

[@mudnducs]

Put two on a Road King please.

[@DKCustomProducts]

We've put thousands on Road Kings over the years! 👍😎👍

[@rykerolaoghaire8781]

DK!!!!!!

[@DKCustomProducts]

Thank you! 👍

[@gabrielzachary9704]

G’day buddy, this might seem like a silly question I’m new to Harleys but I’m assuming the baffles on my Screamin eagle slip Ons need to be removed before installation? And I’m also assuming that on a dyna efi model it needs to be re-tuned ?? Cheers

[@DKCustomProducts]

If you cannot see straight thru the baffle (which is the case with most SE Slip-ons, then they will need to be removed. Here is a chart for know what size to get. www.dkcustomproducts.com/choosing-the-right-size-thunder-torque-inserts.htm If you have a good tune right now, and all you do is remove the baffles and install the TTI's, you will NOT need a retune. Here is video you may find interesting/useful- kzbin.info/www/bejne/ZqfFhZ6Iq6uUbpI

[@gabrielzachary9704]

@@DKCustomProducts brilliant I appreciate all the info. Have a good ☝️

[@DKCustomProducts]

Thanks man, you too! 👍

[@44mrclean]

Will these work well with drag pipes on a 96 sportster?

[@DKCustomProducts]

Absolutely, the TTI's will help stop the reversion and it will run stronger and you will get a fresher charge in the combustion chambers. Here is a link to a report on exhaust that you may find interesting/useful - www.dkcustomproducts.com/harley-exhaust-myths-and-facts.htm Here is a video on backpressure that you may find interesting - kzbin.info/www/bejne/o4uYZIyFlLeNZqc Here is a link to a report to help you decide what size TTI will work for your exhaust - www.dkcustomproducts.com/choosing-the-right-size-thunder-torque-inserts.htm Please feel free to contact us with any question; [e-mail] 662-252-8828 Thanks for commenting! MB

[@CantTreadOnMe]

So I have to drill a hole big enough for mine too fit. Do I also need to thread the hole after I drill it or is the hole good enough? If so what is the tool and size of it that I need to thread it? Thanks.

[@DKCustomProducts]

No you do not need to thread the hole. The hole needs to be ⅜” in diameter. Here is a link to the installation instructions for the thunder torques that may help answer any questions about installation you might have - www.dkcustomproducts.com/media/wysiwyg/Updated_9_16_22_Thunder_Torque_installation_instructions.pdf Please feel free to call us at 662-252-8828 or email our customer service at [e-mail] with any questions you might have. Here is a link to a report to help you decide what size thunder torques you need - www.dkcustomproducts.com/choosing-the-right-size-thunder-torque-inserts.htm Thank you for commenting!

[@CantTreadOnMe]

@@DKCustomProducts Perfect! Thank you. I'm gonna drill out a 3/8 hole in the 9 o clock position on each muffler for my inserts. Thanks again for tour help and fast response as always. Ya'll are machines!! You answer every comment, IMPRESSIVE!!

[@DKCustomProducts]

@@CantTreadOnMe Sounds good man, I think you'll be pleased. We appreciate the kind words, we are always happy to help fellow riders. Thanks for watching! Let us know if we can help you with anything else. Ride safe!

[@wb4514]

I would assume that any one of the 3 sizes would work on a 4" Harley muffler. From your research, which size would be best for a 107 M8 , 4" slip on Drag Specialties slip ons, Stage 1 and 2 with a S&S 475 cam kit ? Thanks.

[@DKCustomProducts]

Here is a link to the sizing chart- www.dkcustomproducts.com/choosing-the-right-size-thunder-torque-inserts.htm Looking at the chart, and that you have a 4" muffler, the 258 is what you want, UNLESS you have a baffle in there that the inner diameter is less than 3". If so, follow the chart for sizing. Also, feel free to email or call with any questions. [e-mail] 662-252-8828

[@wb4514]

@@DKCustomProducts Thanks, I’ve studied the charts. Some users here on KZbin have commented that they may be too restrictive. I assume that you’ve experimented with all sizes in the larger mufflers, so I was wondering if a smaller size would be better? Anyway, I placed my order this morning for a pair of the 258’s. Wish me luck ! Thanks,Bill in Florida.

[@anthonyprovenzaleinc]

If this helps, i removed the stock baffles and cats from my 2022 street bob 114 with 3.3” inside diameter pipes and used the 258s and they sound incredible. Noticeable power gains.

[@DKCustomProducts]

@@anthonyprovenzaleinc Glad you're liking the sound and enjoying the power gains.

[@terrymcquade8341]

I'm no genius so forgive me if this seems like a dumb question but my bike is already dyno tuned so would it need adjusting when adding this?

[@DKCustomProducts]

You will not need to retune it. If you already have a good tune, you will only get more power by adding these. Here is a video that you may find interesting regarding how the ECM can make adjustments on its own- kzbin.info/www/bejne/ZqfFhZ6Iq6uUbpI

[@OCBray]

Can these be added to Cobra 909s? If so what size would you recommend?.

[@DKCustomProducts]

Yes, they can be used with Cobra 909's. With or without the baffles. There are different size 909's depending on the bike. Use the chart at the following link to determine which size TTI for your 909's and if you are going to leave the baffles in or remove them. www.dkcustomproducts.com/choosing-the-right-size-thunder-torque-inserts.htm

[@franktirado8357]

Can these be installed on a trike, also will it impact the warranty?

[@DKCustomProducts]

Yes, the TTI's are a universal item that fits almost all exhaust. You can email or text our Customer Service a picture looking into your exhaust and the measurement 1-2 inches into your exhaust and they can help you choose the correct size; [e-mail] 662-252-8828 We have never had a report of a TTI voiding the HD OEM Warranty. If you are worried about the warranty and have to take your bike in for any warranty work you can always take them out and then put them back in when you get the work done. Thanks for commenting! MB

[@franktirado8357]

@@DKCustomProducts do you need to remove the baffles?

[@DKCustomProducts]

It really depends on your exhaust! If you have the stock exhaust you will have to remove the baffles to insert the TTI's. For some after market exhaust you can install into the baffle. Here is a written report on Exhaust with a good portion about Exhaust with TTI's that you may find helpful- www.dkcustomproducts.com/harley-exhaust-myths-and-facts.htm You can also email or call us with what kind of exhaust you have and our Customer Service will help you decide what you are looking for and what will work best for you. Please feel free to contact for any questions you might have; [e-mail] 662-252-8828 Thanks for commenting! MB

[@billdonnell9856]

How are they with a Tri Glide with stock pipes ?

[@DKCustomProducts]

Here you go, stock exhaust with the TTI's installed (with baffles removed). Will not work with stock pipes with the baffles still in place. kzbin.info/www/bejne/mYDWYmCYibWsmbc Feel free to email or call with any questions: [e-mail] 662-252-8828

[@robertprosser6856]

Unfortunately I can't find these here in the UK. Also do the baffles have to be removed from Rinehart slip ons?

[@DKCustomProducts]

Baffles do Not need to be removed from Rinehart slip-ons to use these. We do ship to the UK. We used to have a Dealer in the UK, they went out of business during the pandemic.

[@robertprosser6856]

@@DKCustomProducts thanks for the swift reply. The only issue I can see may be the import taxes etc.

[@DKCustomProducts]

Shipping costs, taxes, duties, crazy costs from governments and, well, governments, since they seem to be affecting the price of oil which directly impacts shipping costs. Have you looked on Amazon or ebay? Maybe they can get them to you for less shipping costs?

[@robertprosser6856]

@@DKCustomProducts thanks I'll have a look

[@murderjunk420]

Can I use if I'm straight pipe

[@DKCustomProducts]

Yes, they work best with a straight pipe. 👍😎👍

[@darrenlingerfelt5879]

👍👍

[@DKCustomProducts]

Thank you! 👍

[@Nomad-71]

👍

[@chipgroff9664]

What do you do for Vance and Hines big shots staggered for softail?

[@DKCustomProducts]

The 158's at the link below will give you a nice bump in low and mid range power...using either the standard baffles or no baffles. If you are running the quiet baffles, you can use the 118's, or remove them to use the 158's. www.dkcustomproducts.com/thunder-torque-inserts-158-model-family-dk-tti-158.htm

[@chipgroff9664]

@@DKCustomProducts thank you

[@DKCustomProducts]

@@chipgroff9664 no problem!

[@noelwaterman6021]

Quick question, would this work with the new rev max engined HD'S?

[@DKCustomProducts]

We have done no testing on those engines. They will work with any ICE, but their purpose is to increase torque, and the revmax is a higher rpm engine than a traditional Harley, where HP may be more important than torque.

[@noelwaterman6021]

@@DKCustomProducts Thank you for response, I finally got my hands on 22 nightster and trying to make plans for a future exhaust upgrades. Also you videos are amazing, keep up the great work.

[@DKCustomProducts]

@@noelwaterman6021 Thank you! Congrats on your new ride! Please let us know what you experience if you try the TTI's on that bike.

[@MrJruta]

Love DKs stuff 👍

[@DKCustomProducts]

Thank you! 👍

[@rubiconguy6599]

Will these work with the 4” Tab Performance slip ons with Zombie baffles?

[@DKCustomProducts]

The TTI's are made to produce more low and mid range power, they are not compatible with the Zombie Rings. Remove the Zombie ring and use the TTI for best performance. Taken from the TAB website- "The Ring... is primarily for looks ... They look great inside of the muffler cap and really help set your bike apart."

[@phillipjohnson1319]

I read on Tab Performance's site that they recommend putting something like this just inside the header past the slip-on attachment. With what I've seen here, what is the benefit of one install over the other?

[@DKCustomProducts]

@@phillipjohnson1319 Watch the video linked below. Tab is wrong. Reversion starts at the exit end of the slip-on, and reversion starts there, slow down exhaust gas velocity. Having it at the front (engine side) may help, but not nearly as much as at the exit end. kzbin.info/www/bejne/pqOZq2NmnLFoj8k

[@phillipjohnson1319]

@@DKCustomProducts I appreciate the answer! I want to do it right the first time, so there isn't a second time.

[@DKCustomProducts]

@@phillipjohnson1319 No problem! Doing it right the first time save time and money!

[@doug3805]

It sounds like an exhaust leak with those in IMHO.

[@DKCustomProducts]

How do these sound? kzbin.info/www/bejne/faasmH5jp8hlqZY

[@KodiakCO]

I'm totally shocked by the TTI's. I have a stock 2005 Electra Glide Classic with 3 inch no name slip on mufflers. I ran it without baffles for a day and it just didn't feel right. The power wasn't there and the sound was horrible bubbly. I got my W258 TTI's in and installed them this past Saturday. OMG, what a difference. Seat of the pants power is much better and consistent. The bubbly sound is gone and the decel pop (which I like) has a deeper softer sound. The sound is smooth and lower now, my wife LOVES it. Thanks for a great product. I did upload a video of the after sound too. kzbin.info/www/bejne/jn_Wopubq6hsaK8

[@DKCustomProducts]

Glad you are enjoying the improved power and improved sound. Thanks for making the video. We appreciate it, and your business. I have added your video to our TTI playlist. 👍

[@matsnaslund5762]

Sounds better without!

[@DKCustomProducts]

How something sounds is often subjective and depends on the listener's perspective. A lot of people like the sound with the TTI's and some do not. Thank you for your perspective! 👍 MB

[@mikelovestoride2367]

Sounds Raspy on the video, maybe if they were installed towards the middle of the muffler

[@DKCustomProducts]

Reversion happens at the end of the pipe. That is why they need to be placed 1-2 inches into the pipe, not in the middle. You can see a written report on exhaust that you may find interesting/useful at this link - www.dkcustomproducts.com/harley-exhaust-myths-and-facts.htm Here is a newer video on the TTI's that you may find interesting - kzbin.info/www/bejne/Y53cmaCKqNOibqc Thanks for commenting! MB

[@dw6506]

Is this what is referred to as a lollipop

[@DKCustomProducts]

They are a refinement, or an evolution of the classic lollipop principle that has been around for over half a century. Many years ago we spent countless hours working to see if we could Improve the old lollipop (washer on a bolt) design. We made dozens and dozens of prototypes, all in an effort to reduce reversion without increasing back-pressure. Street Testing and Dyno Testing of hundreds of variations finally evolved to the Thunder Torque Inserts™ seen below. They have a rounded wave shape that makes the exhaust gases flow easily over them on exit, and the cupped shape on the other side catches the reversed pulse wave (reversion), preventing it from traveling back up the exhaust tract. These are Patented due to many unique features. The bottom line is that they create very little to increase back-pressure, and in fact, speed up exhaust gas velocity because of the unique shape. At the same time they reduce reversion. The above was taken from a written report that can be seen at this link- www.dkcustomproducts.com/harley-exhaust-myths-and-facts.htm There is a video that describes the subject here- kzbin.info/www/bejne/pHOTiXeHi897b7s

[@brockwiles444]

No tune needed

[@DKCustomProducts]

Correct. 👍