Exhaust Baffle DB Killer Removal KTM 390 125 250 200 1290Duke Exhaust

[@bhunt6199]

My left ear enjoyed your video

[@MotoMirius]

Thanks. I’m not sure why the sound is in mono only 🤔. Unfortunately since I’m deaf in my right ear I didn’t notice in editing 🤬. Skäl. David

[@felakawilam5747]

Fine with meee

[@Thulldai]

Yup, i thought the right side of my earphone stopped working😆😆😆

[@XNK--C]

@@Thulldai same 😬

[@MotoMirius]

It’s just to test who is paying attention 🤔

[@bvkstha4944]

I love the stock silencer of the new KTM duke 200, 250 & 390. It's looks so good.

[@MotoMirius]

Stock silencers are pretty good quality, so if you like them, then no reason to change.

[@codymouret]

38mm worked as that was all I could find at the local hardware store. Also when cutting, after a few minutes the cutting will change from smooth to getting caught up on jagged edges. this indicates you have cut thru the material. Carefully proceeding to cut until only a little material is hanging on, use pliers and work it until loose and no worries about fishing it out or large amounts of metal shavings getting in the exhaust.

[@MotoMirius]

38mm can be difficult if there are large welds. Glad you got it through ok and great advice 👍. Skäl. David

[@carlos-cj2862]

Yeah I’m having trouble with a 38mm

[@travancorepistons7309]

Hi.. can we change the tank of 2012 ktm duke 200 to 2020 duke tank..

[@MotoMirius]

I don't have a gen 1 but don't see any reason why not. You may need to make modifications to brackets and seat will be an issue

[@michigantroutaddict4910]

Just drilled mine out and it definitely sounds much better and doesn’t seem to have caused any low end power loss. I did notice I’m getting an occasional lean pop but the bike also popped before I drilled out the silencer. Definitely going to pick up a piggy back ecu soon.

[@MotoMirius]

Sounds great. Yes, more pop is normal as the air flows more freely. Not always lean running. Pop is also caused when throttle shut off dumps unburnt fuel into the exhaust

[@MelegaPF]

Great!!! I bought a Duke yesterday and today on morning remove original db killer as you.

[@MotoMirius]

Great stuff!

[@KROWARIZONA]

Could you give me the specification about this (in 3:14 video) tool please? I’d appreciate. Thank you

[@MotoMirius]

It’s a 40mm hole saw for metal. For this job just a cheap one is fine. Skäl. David

[@lunarsolis8109]

Hello, what’s the size of the bit you used ?

[@MotoMirius]

I use a 40mm hole saw

[@mr.mystery-X]

So did i get more tor. Or hp. If i do the same at my duke 390 or not?

[@MotoMirius]

Not that you will notice. Getting extra power normally requires adding little bits from several different changes. Some people have claimed a loss of power, but there is no one single simple answer (despite what some sellers might want you to believe).

[@10sss77]

This video is really informative and not many on these bikes at all so thanks a lot, I’ll take the advice of the decat pipe but keeping a baffle 👍

[@MotoMirius]

Thanks. Typically I run a decat, keeping the presilencer. This allows me to run any slip on I want - from quiet to loud without any risk of it being too loud.

[@garethmayfield4014]

I've just tried this with my 1290GT. 51mm hole saw. what a nightmare!!!! saw would not touch it. ended up chain drilling with a 2mm coldest drill. sounds fab though.

[@MotoMirius]

Glad you got there in the end. Stock exhaust is quite high quality - not sure about the 1290 but I'm assuming that it's also stainless which is really tough to cut and you need a decent quality metal hole saw which is also long enough. But what counts is making it work, so fantastic! Skäl David

[@natvega1]

It will also change your air/Fuel ratio set by the manufacturer on your ECU, You can backprobe your oxygen sensor with a multimeter and verify for yourself before running too rich and having black spark plugs and a smelly exhaust. You can also put in a baffle on the other end of the muffler that is shorter for more sound.👍

[@MotoMirius]

This is within the parameters allowed by KTM in the ECU, so no need to do anything complicated. So long as you've done nothing else of course.

[@cbzhoney]

Sir what will happen if we cut the waffle in half and again weld it in?

[@MotoMirius]

It will be a bit louder. See my other videos on this exhaust. For example Removable Baffle DB Killer Stock Exhaust KTM Duke 390 125 250 kzbin.info/www/bejne/nXeph3Shh9t0paM. Skäl. David

[@duken8115]

what is the sound? Can you make a video and show the sound?

[@MotoMirius]

Check out my other exhaust videos for the sound. Skäl David

[@rjtastic]

bro when you record the audio just use the "mono" setting or just use mono settings in your editing program! you'll never get unwanted results that way. informative video tho.

[@MotoMirius]

Thanks. This is the only video I’ve had this problem with. If I weren’t deaf in my right ear I would have caught it in post. Skäl. David

[@rjtastic]

@@MotoMirius oh my god I'm really sorry on behalf of all these hate internet trolls.

[@MotoMirius]

RP ha, no problem. It’s just very irritating that I didn’t realise until it was uploaded and live. Just one of those things! Skäl

[@janmajnik6889]

@@MotoMirius consider a cheap lav mic. Would improve your sound in the videos a lot! I really enjoy your content!

[@mollyx6306]

what about duke 690 2010? exhaust is under the bike

[@MotoMirius]

This applies to many bike but the earlier 390's don't have a standard exhaust setup so I guess the 690 will be the same and it won't work

[@Firby1988]

Is there a restrictor ring in the cylinder head on these bikes behind the exhaust header as on eBay a few engines have what looks to be a restrictor pushed in to the exhaust port

[@MotoMirius]

No, it's just the shape of the exhaust port. The main restrictor on the 390 is the dent in the header, which depending on who used the hammer that day in the factory can be quite large. The Tyga header shows no dent is necessary - but only fits a gen 1 system. Skäl David

[@Firby1988]

Moto Mirius would it fit the 125 or would it be to big ?

[@antarikshverma1810]

After are moving Db Killer Is the bike Performance Decreases?

[@MotoMirius]

Some people say yes, some people say no. Unfortunately bike tuning is not so simple and depends on many other factors.

[@niktopore7734]

Will this work on my 2020, 1290 super duke gt? I already removed the cats. Only have the stock slip on

[@MotoMirius]

I'm told that it does by people who have done it, but I can't speak of every generation of 1290 as to what exhausts are fitted.

[@shahidyousuf5392]

"I used heat gas welding to remove the db killer from exhaust of my KTM Duke BS6. I successfully removed it, but the heat caused two big holes in the exhaust net near the end of the exhaust. Will these holes make the sound louder or quieter? Could there be any problems with the exhaust or engine because of these two big holes? Please reply."

[@MotoMirius]

This is why I do not recommend that method of removing the DB killer. The heat will also have damaged the insulation in the silencer so you can expect it to be louder than it should be. It should not create any issues with the engine so long as you have made no other changes to the bike - air filter, cat delete etc. If you are concerned, get another silencer and try again or use something like the FuelX Lite to make sure the engine runs correctly.

[@shahidyousuf5392]

Thanks for your reply. I want a louder exhaust. I was worried that it might cause any problems. Now you have reassured me. I appreciate you replying to my comment. You've got a new subscriber. Thanks, buddy!

[@andrescadenaespejo7174]

What material is this Bosch toothed cup made of? Can it be used with a normal electric drill?

[@MotoMirius]

That is a normal electric drill - a drill with a cord will normally have more power. The hole saw is one for cutting metal - one for making holes in wood or a cheap one will not work because the saw teeth will not be hardened enough - it's not so much what it's made of but how well it is hardened.

[@andrescadenaespejo7174]

Hello. So a cable drill is not useful for removing the DB killer?

[@MotoMirius]

@@andrescadenaespejo7174 Cable drill is always better than a cordless drill - just not as convenient to use. Keep it on the slower setting and take your time - if you overheat the blade, which is easier with a more powerful drill, the cutting tips will lose the tempering and stop cutting.

[@RajeshThakur-mu2uf]

Sir what is the size of hole saw.Please reply.😢😢😢

[@MotoMirius]

The size mentioned in the video description. Make sure that it is a good quality metal saw - a saw designed for wood will not cut.

[@siddharthsingh2808]

First i thought that my left earphone isn't working 🤣🤣🤣

[@MotoMirius]

I'm glad to see that my test to see if you were paying attention worked :D Skäl David

[@MotoMirius]

@Mags64 I'm deaf i my right ear - I can hear sound coming from the left - I can't hear if the right headphone is making sound. The right headphone plays sound captured by the right mic channel and in this case no sound was recorded in the right mic channel - no inversion, that is sorted in the mic.

[@MotoMirius]

@Mags64 Ha, no problem, it's just annoying that it happened and I didn't catch it before it was published and it got locked down.

[@mentoocreations8789]

I tried but the wholesaw blade has been bended so no cut

[@MotoMirius]

You need a proper metal saw blade. There is no point trying to cut stainless steel with a cheap blade intended for cutting wood.

[@jespertordebringjansson1397]

how to fix the sound in sound blaster xfi5 software: turn sorround on to 100%, turn smart volume on normal to 60% and balanse the audio to +5 on the right ear in the realtek audio software, and boom you got the sound on nearly both ears!

[@MotoMirius]

Good to see some lateral thinking at play. Skäl David

[@Dannyfr33sh]

Removing this adding k and n high airflow filter and coober high airflow intake lid coupled with a Powertronic ecu would I have to change map ?

[@MotoMirius]

If you fit the airbox lid then yes.

[@kaleemmohammed7215]

Does removing the dn killer kills the engine ? Or affects??

[@MotoMirius]

The Akrapovic slip on that KTM sells is more free flowing than this conversion and KTM are very clear that no changes are needed when fitting the Akrapovic

[@hectorvalero8562]

Does anyone know if this works for the 2019 model?

[@MotoMirius]

2019 has the same exhaust. Skäl. David

[@chazphot]

Never seen someone use a hole saw for getting out a welded baffle before but it seems like a great solution. I was waiting for you to get that swarf out with a handful of throttle :)

[@MotoMirius]

Ah, I just can't tell you how tempted I was to do exactly that, but I could just see all the negative comments :D Skäl David

[@transdetendal]

eny idea on " fixing" a stainless motad 4in1 ? i hate the restricktion on it !!

[@MotoMirius]

Motads tend to be welded so might be difficult. Depends on what it looks like. Skäl. David

[@transdetendal]

@@MotoMirius yup its welded and in one with the 4into 1 ... skål and have a good one !

[@ravikiran3320]

Which drill machine i need to buy and also please tell me what is that attachment of 40mm?

[@MotoMirius]

Whatever you have - you could do it by hand but it would be hard work. It must be a good quality metal hole saw - nothing else is going to cut through stainless steel easily.

[@mattbowman3641]

Jeeeeeesus!!!!40mm lol I've just realized I've been using a 38mm and I've effed it lol why didn't i check out your vid sooner?!lol..thanks mate

[@MotoMirius]

Smaller works, just harder to cut through! Good luck! Skäl David

[@mattbowman3641]

It really didn't i bought a brand new saw bit,lubed it with cutting oil..it seem to just chatter around because of the loose fit..anyway it stripped the teeth lol.after i seen your vid i went back and gotta 40mm and bingo haha it sounds waaaaaay better man!!

[@MotoMirius]

@@mattbowman3641 Yeah, the reason for going bigger is because you avoid the weld in the centre. It's stainless steel so very hard and will blunt the teeth - it's why I recommend as large as you can fit in there. Some people have managed it with 38mm but.... Glad you managed it! Great job!

[@mattbowman3641]

@@MotoMirius cheers mate,same here!!I'm lovin' your 390 vids man.lol keep em coming!!🤘🤘i think my next step is a new bars setup and power commander 5 with k&n.

[@MotoMirius]

@@mattbowman3641 Thanks and sounds like a plan. Good to see that Dynojet have finally stepped up and now offer units for the gen 2 Dukes.

[@migueltavares3815]

This remove dont burn the valvules???

[@MotoMirius]

Not by itself, I wouldn't expect it to - if this concerns you then look to add something like the FuelX Lite to give a richer mixture.

[@skrrrttt999]

I did everythinf right, I have cutting oil and 40mm diameter 44mm lenght saw for metal, but it is taking me about 6 hours now and I still have a few milimiters to cut, is it a matter of being very patient for some of this exhausts or what?

[@MotoMirius]

Two possibilities - not a good quality saw (this is stainless steel so a hard metal and your saw is now blunt) or the nose of your drill has hit the end of the exhaust so cannot cut any deeper

[@skrrrttt999]

@@MotoMirius thanks for answering, saw didn't hit and I tested two good saws for metal, I guess weld is just very thick, I see progress it is just very slow, I'm about to hit 30mm depth so I hope I will finish this in a few hours

[@skrrrttt999]

@@MotoMirius and thank you for making this video

[@skrrrttt999]

​@@MotoMiriusI did it, saws I had were meant for metal but they didn't cut stainless steel, I bought bosch like you and it worked instantly

[@MotoMirius]

@@skrrrttt999 Great job!

[@korymatthew8275]

Can I ask what I would do when it came round to the MOT?

[@korymatthew8275]

Have to bare in mind I don't have a welder to just pop it back in.

[@MotoMirius]

MOT doesn't test sound levels for bikes. You might get an advisory for loud exhaust but most testing stations wouldn't give you that for this - take the cat out as well and you are in different territory - mine is decatted with baffle and it doesn't get an advisory at my local station.

[@TheJWC56RSA]

I bought the same cutter and tried it on my 390... after about 5 min of cutting I can barely see a cutting mark inside the exhaust.... I tried some expensive 4mm high end carbon drills to perforate the pipe (suitable for stainless steel) and even those struggle to drill through! (I used slow speed and enough oil). The exhaust seems to be very hard steel...

[@MotoMirius]

I’ve heard of people having trouble. Are you sure that the chuck isn’t fouling on the baffle? If the teeth can’t reach they can’t cut. It’s only 1mm steel but it is stainless so it will tough so it needs a hole saw for metal. Skäl. David

[@TheJWC56RSA]

@@MotoMirius The part I drilled through looks like 2mm or more stainless... the cutter is made for stainless and not touching - it is a 38mm cutter - I can only guess I'm going through the weld inside too....

[@MotoMirius]

That’s possible and if you are using 38mm you are could be into the thicker part where it curves back into the baffle. I’d still double check you aren’t hitting the tip of the baffle

[@DeeAutomates5819]

Any engine problem ?

[@MotoMirius]

No. And no reason to have any. If you make more changes then you need to consider a piggyback

[@Superdisco199]

So what's better - de-beffle or de-cat ? you would lose torque and backpressure with de-baffle ? is the inside end of the baffle tube open ? thanks heaps

[@MotoMirius]

Define better? The bike has three silencers - cat, presilencer and tail silencer. Most of the sound reduction is in the cat and presilencer. Removing the baffle makes the bike a little louder. Removing the cat and presilencer makes the bike a lot louder. Most of the back pressure is created by the cat - back pressure from the baffle has to go back through the cat to get back to the engine. Tuning is a complex subject and will be affected by where you ride - altitude, temperature, humidity etc. Some people report loss of torque from removing the baffle others don't - but since no one has put the bike on the dyno before and after the change, these reports (and mine) are speculative. Baffle and cat are the only parts of the system that reduce sound by constriction. Most people make these changes to improve the sound of the bike, not to make it faster. Skäl David

[@Superdisco199]

​@@MotoMirius Thanks for that... in my experience I've found bikes generally lose some torque when gutted for a better note. Whether its a crf250x or an MT07, you just notice it doesn't loft a front wheel as easy. So I guess in terms of better I just mean nice solid stock like performance but with a little more depth to the note. I can tell just from the KZbin videos that it certainly seems less constricted when revved without the cat(mini cat delete).. but not sure how far will be too far with the bike. Worried that the modified muffler will put me in ag bike land with a boggy feel and was hoping to avoid complete new slipon. (I feel like the pre muffler def. needs to stay)Appreciate your comments.

[@MotoMirius]

@@Superdisco199 This was an area I was attempting to address in one of my recent videos but going back into lockdown means I can't get back on to it. My experience is that the baffle removal on a stock system is no louder than the legislation compliant Akrapovic slip on that KTM supplies - my feel is that sound is similar once you debaffle and stubby the stock silencer. As I run a piggyback ECU, I would need to buy a bypass unit for that before I could realistically say what it does to torque. I've been told by someone who has used a dyno that best power comes from cat removal, leaving the presilencer in place and using the Akrapovic slip on.

[@Superdisco199]

@@MotoMirius Thanks for that. I just watched your ECU vid. Nice work. I just got the bike and took the whole secondary/final muffler off and it actually seemed to boost the power (wheelied in 2nd). But it had a pretty nasty backfire. Your first stage baffle removal didn't backfire did it ? sounds a bit like I might need to get the RapidBike Easy at the very least.. Bike seems pretty jerky (2020) down low and then flat spots and then comes good. Really suspecting that mini cat removal and single debaffle would be the best trade off, but it's really thejerkyness bothering me most of all. My 250F is carbed and reklused! :-D

[@MotoMirius]

No backfire but I always run a piggyback. Backfire is typically a sign of running lean but it can be normal if it’s just on the overrun when there is excess fuel dumping into a hot exhaust with no baffles to absorb it.

[@tenaki8]

Mine didn’t cut I used a brand new one, maybe it wasn’t good quality?

[@MotoMirius]

Did you use a metal saw? Many hole saws are designed to cut holes into wood. This is stainless steel - it's a hard metal to cut and takes time.

[@tenaki8]

@@MotoMirius I’m pretty sure it was maybe I’ll go to the hardware store and get some help on purchasing another hole saw. Thanks for the reply👍🏽👍🏽

[@tenaki8]

Just did it today and it worked i didn’t have the right hole saw the first time around 😄🤦🏽‍♂️ with the removal of the baffle will the bike lose any power🤔

[@MotoMirius]

Good job. According to KTM, fitting the Akrvpovic slip on requires no changes - and this is a smaller change than that, so it's unlikely to cause issues and I've never heard any complaints about it.@@tenaki8

[@Dhanush-vy6wk]

How to remove Himalayan stock exhaust black cap

[@MotoMirius]

Do you have a link to that?

[@andrescadenaespejo7174]

What size is this saw tool? 2:46

[@MotoMirius]

As per the video description it's 40mm.

[@vittoriodantona6378]

Once Removed, can you put it back? I live in a city and there’s lot of police

[@MotoMirius]

I live next to a major airport so police presence is very high with a lot of bored police looking for something to do. I have a separate video on how to make it removable.

[@melallanaseron5552]

Hello from the Philippines... Do I have to replace my ecu for piggy back type if I will do like this exhaust?

[@MotoMirius]

Hello. Most people consider that unnecessary for this mod. KTM advice is that no change is necessary when fitting the more free flowing Akrapovič exhaust so I see little difference here. Skäl. David

[@samuelwright2219]

I have tried this with the exact same hole saw but it's not going through 🤷‍♂️any tips

[@MotoMirius]

How easy and how long to cut depends on the thickness of the weld. If the centre of your hole saw has hit the baffle you will need a longer hole saw.

[@sairamjella3526]

Any milage changes after removing db killer?

[@MotoMirius]

I don’t measure mileage. But as I will always say - it’s likely to make it worse because you will rev the engine more to hear it and revving the engine is always bad for mileage.

[@enairb.3986]

we also do that in Philippines after enlarging the hole we put fiber to make deeper sound we call that "kalkal"

[@MotoMirius]

Sounds interesting 🤔 Skäl. David

[@enairb.3986]

my comment got a heart❤

[@MotoMirius]

Nocturnal PlayZ of course. Great content 👍

[@enairb.3986]

oh thank you!!

[@shobharani2698]

I'm stiil gonna buy the Akrapovic just because it looks sooo good on the duke 390

[@MotoMirius]

Nothing wrong with buying parts because they look good!

[@devadeva1544]

hy bro this trick uses in bs6 bike??

[@MotoMirius]

I've seen the same done to BS6 bikes, so yes. Skäl David

[@sayantanbasu06]

Won't pass emissions in India I think.

[@MotoMirius]

This is a popular mod in India.

[@ultralinx200]

I had Gsx R 150, gsx r 125 people called it in euro. Can i doing it on my stock exhaust? It LOOK i can do it, because the tip looks like your exhaust, but i have no idea about how it look like inside

[@MotoMirius]

I haven’t done it. It looks like you can and if you have a welder then you could try it and weld it back up if it doesn’t work. Hard to know until you do it as you can’t see the construction inside.

[@zeez9053]

Yes that’s how u do it but what about fuel consumption/is it better for bike for the engine to breathe /is it better for horse power etc ? Loads of questions not being answered

[@MotoMirius]

This is a video on how to do it - the other questions are subjective and largely dependant on what you are doing and many of them will depend on where you live and how you ride. Each of them needs it's own set of videos to make any sense - I have started a series of short videos to discuss the basics behind your questions because the answers are not as clear as I suspect you think they are - it is not a case of do this, do that and then this happens - no matter what some videos might want you to believe. A quick example - this will increase your fuel consumption - not because it makes the engine less efficient but because you will rev the bike more once you can hear it and this burns fuel.

[@zeez9053]

Moto Mirius Thank for your explaination and your time

[@MrAmorti]

Magnet on a stick would be a good tool to retrieve the baffle and clean up the cutting swarf

[@MotoMirius]

It's stainless steel - magnets don't work very well. But you can certainly use a stick and maybe some tape to achieve the same. Skäl David

[@s4mw0w41]

I attempted this on my 2022 390 Duke a couple times unsuccessfully. The first time it turns out I had bought a wood hole saw so I went back out and got a 38mm metal hole saw along with the hole saw mandrel and that still didn’t work. Could it be that I didn’t use cutting oil or should I try a 41mm which is the next closest size available?

[@MotoMirius]

I think many people have made the mistake of not realising that there are different types of saw - this is stainless so it's harder than steel so it really needs a good saw for metal. Use a slow cutting speed not a fast one - oil helps to avoid the blades getting blunt so they keep cutting. What can happen is that the nose of the drill hits against the baffle - if this happens then you won't be able to cut any more - and it can take a long time anyway. Check that the drill isn't hitting and if so, see if you can move the saw a little bit further out - changing size of saw will only help if this is the problem if it is longer. Good luck, it should work for you.

[@skrrrttt999]

did you end up cutting it?

[@joshuabell473]

Great video. I want to know. Will this affect the decompression of the engine

[@MotoMirius]

Thanks. KTM state that fitting the Powerparts Akrapovic slip on requires no changes to the engine - this does not have a bigger effect than fitting the Akrapovic

[@Dannyfr33sh]

Can I use lithium grease as the lube to cut out the baffle ?

[@MotoMirius]

Yes, oil is better, but something is better than nothing, just use a slow speed and let the cutter cool down as stainless is a hard metal

[@akash1281]

Does it harm the engine....iam planning to do the same...suggest me ,should I do it or not....plz make a video on this topic....iam waiting

[@MotoMirius]

I have a video planned regarding my thoughts on the subject. I will make it sometime soon. Skäl. David

[@akash1281]

Moto Mirius sure,will be waiting for the video....👍

[@rajpriyam6640]

Is your bike safe? Did you removed the db killer? How's the bike now?

[@alexmaya9487]

Why you take off the rivets of the side out?

[@MotoMirius]

I don't understand your question. You can take the rivets out - check my other videos, but it isn't the best way to do this.

[@samueljung2165]

Hey a question = Will my cb650r have the same baffle system? Checking before sawing in

[@MotoMirius]

You should be able to check by looking at the back end of the silencer. Skäl. David

[@samueljung2165]

@@MotoMirius look into it with a flash or something? Thank you for fast reply!

[@samueljung2165]

@@MotoMirius I don't like the look of aftermarket exhausts but you gave me hope

[@samueljung2165]

@@MotoMirius I need help. . . ㅜㅜ

[@MotoMirius]

You will need to determine how the exhaust is constructed and how the baffle is held in. Many OEM exhausts can be modified but sometimes it is too hard. I don’t have a CBR650R so I can’t comment.

[@dhruvsingh2666]

hey i am from india with duke 250 and i wanted to know that if it is possible to install ktm rc 200 fairings on duke 250 to make it rc 250. i am keen on this because there is no rc 250 in india. its if even with adjustments done to chassis. is it possible

[@MotoMirius]

RC is mostly a pre 2017 Duke chassis so if you use a gen 1 it might be possible. But you will need tank etc so it will be a big job and likely expensive.

[@dhruvsingh2666]

Moto Mirius yes it is 2018 bs4 abs version with same design as the one you are modifying

[@MotoMirius]

Probably easier to put a 250 engine into an RC.

[@dhruvsingh2666]

Moto Mirius does it cost much, do we need to change the filter fuel pump and other sensor.

[@davidgasparatos4531]

I did this on my ktm duke 125, it sounds a lot better but I think it feels a bit slower, does the removal effect the acceleration?

[@MotoMirius]

Power tuning is a complex subject. I don’t think this has much impact on acceleration but you’d have do dyno runs before and after to really know. Skäl. David

[@ultralinx200]

@@MotoMirius dyno is much expensive than buying new aftermarket exhaust

[@MotoMirius]

Yes it is. But without using one you are only guessing what the impact is of any modifications. This is why companies like Akrapovic use a dyno when designing new exhausts. Louder exhausts sound faster but may actually be slower.

[@connorpitts639]

My bike has no catylic converter. Will it be harmful in any way to the bike if I remove the DB killer as well? Thinking of doing this so I’d like your feedback. Thanks.

[@MotoMirius]

As a rule of thumb I recommend only one change if you want your bike to be safe. But it is easy to fit something like a FuelX Lite to keep your engine safe - engine rebuilds are very expensive.

[@Bscott-390]

Why keep the baffle if you remove the cat? Thanks. great video

[@MotoMirius]

Thanks - a great question. It's a balance as to how loud you want the bike to sound. Personally I rarely have a baffle in, but some people need or want it to be a bit quieter. There are people who run straight through exhausts - but they must either live somewhere where there are no laws or no police and have no neighbours or they don't just have any regard for anyone except themselves. Everyone else has to choose where they want to be on the balance of what sounds good and what is just annoying for everyone else.

[@Bscott-390]

If I cut out the resonator and the cat delete, will I have to do fuel management/tune? @@MotoMirius

[@MotoMirius]

It would be strongly recommended, yes@@Bscott-390

[@bhishamchandiramani2230]

Does removing the baffle on a new 390 , harm the engine in any way?

[@MotoMirius]

It’s unlikely. Akrapovic slip on is more free flowing than the stock exhaust and KTM advise that no changes are necessary when fitting that. Skäl. David

[@kenssnog2768]

@@MotoMirius I guess they have calculated the back pressure before hand and tested on dukes and made changes accordingly to the akrapovic i think. But do you know if it harms in any way if i remove the db killer as you know the fuss about back pressure maintained on stock exhaust?

[@MotoMirius]

Back pressure is important. But I suspect that you are overlooking the fact that this is the tertiary unit. Back pressure is primarily provided by cat and presilencer. If like me you have decatted the bike then it runs better with a baffle. Skäl. David

[@kenssnog2768]

@@MotoMirius Well I didn't know that the back pressure are maintained on cat and pre silencer but I guess even if has slight changes the oem ecu map could adjust for small changes, right?

[@MotoMirius]

@@kenssnog2768 Backpressure has very little to do with the ECU map - back pressure has a different impact on the fuelling. Baffle removal increases air flow which alters mixture which does impact on the ECU map - and the ECU does have some ability to compensate for this.

[@naveedaka]

Why it smokes after debaffling

[@MotoMirius]

My bike smokes before and after baffling. Baffle removal does not make a bike smoke.

[@naveedaka]

@@MotoMirius ok..sir ..nice informative videos...thanks

[@rnm8664]

does anyone know if this is possible on a yamaha mt125 from 2018

[@MotoMirius]

Looking at images, I'd say there was a very good chance it will - but I'll defer to anyone who has one.

[@rnm8664]

@@MotoMirius thanks for the info

[@sohebr6540]

Is sound louder than akraprovic?

[@MotoMirius]

No. If you also shorten it using the video on my channel it will be about the same.

[@sohebr6540]

@Moto Mirius thanks appreciate your time for reply. As long as its not louder its fine by me considering the sound emmission laws I want something just in between stock and an Acra. Appreciate the videos, knowledge and Effort. Saw your other video but not up to my skill set yet. 😃

[@orlandojames2804]

Hi! How loud without db keller?

[@MotoMirius]

It's loud enough to notice it's louder but it's not loud - compared to the KTM Akrapovic slip on I would say it likely still meets all legal sound levels. The cat(s) and the presilencer do the bulk of the noise reduction.

[@orlandojames2804]

@@MotoMirius thanks 🤘

[@neerajbora3733]

How many decibels sound does it make ... in normal engine on and also in high rev please answer 🥰

[@MotoMirius]

I don't have a proper decibel meter.

[@neerajbora3733]

If it is possible to check so please let me know sir because it ll save my panelty in my country ..thnks a lot

[@MotoMirius]

@@neerajbora3733 Any modification from stock will risk a penalty, so if your police check with a meter then make no changes.

[@neerajbora3733]

Can uh make a video on cheap modification on duke 390

[@MotoMirius]

@@neerajbora3733 What do you want to see?

[@Dannyfr33sh]

Will this mod give me power or response difference with Powertronic ecu ?

[@MotoMirius]

Not so much that you will really notice it - but power mods on this bike come from making a number of small changes to the whole system.

[@SCutchins]

You said that you may not want to de-baffle if you de-cat. Why is that? I did a full de-cat, straight pipe from header to stock silence, and the exhaust has a bad "ringing" sound at about 5,500 RPM so I'm considering the de-baffle. Thanks Edit - figured I would add that i added a Powertronic so she's getting more fuel.

[@MotoMirius]

Removing cat, presilencer and baffle is too loud for most places - it’s either illegal or it’s just a police magnet who will pull you over to check what they can find wrong with the bike or your license. Otherwise there is no technical reason you can’t do it but you should seriously consider a proper piggyback as you will almost certainly be outside of the stock fuel map parameters. Detonation can create a lot of damage in the engine and whilst you can ride for a long time without any issues just a few minutes outside of the map will grenade the engine.

[@stevecutchins9069]

@@MotoMirius Thanks for the reply! I do have a piggyback, I edited my comment afterwards to add that I do have a Powertronic, which I highly recommend by the way, massive difference in rideability without that ridiculous stock surging.

[@MotoMirius]

PowerTronic do good systems. Just make sure the map suits your setup.

[@surslaughter3524]

So if I do this and then add a powertronic fuel auto tune device on my stock 22’ 390, I will have a less go cart sound and run less lean while preparing to go full exhaust down the road? I want to go catless but don’t want to void my warranty. So this sounds like the right direction. Except I imagine cutting out the baffle will also void my factory warranty.

[@mktmtu1291]

But does this affect the engine back pressure in long term run ???

[@MotoMirius]

Most of the back pressure is created by the cat and presilencer. KTM wouldn’t be the exclusive sellers of the Akrapovic slip on which is more free flowing than the stock can if they believed there was any risk. But it’s your bike so you must make your own choice. Skäl. David

[@mktmtu1291]

@@MotoMirius Thanks a lot brother... So im planning to remove the baffle .... Which is better than a costly exaust replacement ....

[@abzvlogs5824]

Sir i have KTM rc 390 BS4 i'e 2017 model, i want to remove the stock exhaust baffle, does removing db killer cause engine and mileage? Kindly reply

[@MotoMirius]

KTM sell the Akrapovic lip on - it flows more air than the stock exhaust and is louder even without the baffle. KMT says no changes are necessary to fit the Akrapovic exhaust.

[@abzvlogs5824]

@MotoMirius i am but confused by your replies, we need clear suggestion kindly tell will it blow engine or nothing to do with it. I am concerned about and I don't rev the bike unnecessarily to hear the sound

[@MotoMirius]

@@abzvlogs5824 I have never heard of anyone blowing up their engine by doing this mod - but no one can guarantee that your engine will not blow up. You could have a random fault in your engine which means it will blow up when you ride the bike today without having done the mod. I don't really understand why you think the engine will blow up, so based on what you have said I would recommend that you keep your bike stock.

[@abzvlogs5824]

@@MotoMirius I forgot to mention mileage/efficiency also, is there any compromise on efficiency if we remove baffle? I don't rev engine unnecessarily. And I asked about engine blow because one of my friend's KTM 390 bike asked engine rebuild and the mechanic of KTM service centre told him that your engine damaged due to removing the baffle, maybe the owner didn't maintained well I guess. I am excited to remove the baffle for better sound so I need clear suggestion from experts like you

[@rajpriyam6640]

Does it effect the engine?

[@MotoMirius]

This is covered in the video. Yes, it will effect the engine - but small changes are within the capability of the ECU to adjust.

[@RogueSamd]

I'm going to do that on my husqvarna 701 vitpilen someday when I have one.

[@MotoMirius]

That's a nice bike. Skäl David

[@RogueSamd]

@@MotoMirius i love it

[@MotoMirius]

Thanks

[@alconk7129]

Does your Akropovic have a baffle in our out?

[@MotoMirius]

In. It was out until I did the decat. Then I needed to put it in to avoid being pulled over by every passing police car. Skäl. David

[@nachiketphansekar]

Any drop in average...petrol consumption

[@MotoMirius]

Petrol consumption is governed primarily by the right wrist. The normal response to having a louder exhaust is the rider wanting to hear it, so more blipping of the throttle which uses petrol - so scientific tests of fuel consumption are not really relevant in the real world.

[@corbkuroski1558]

Will this work on a 125 rc exhaust stock?

[@MotoMirius]

As far as I'm aware the slip on is the same, so yes, it should

[@corbkuroski1558]

@@MotoMirius nice one mate

[@ravikiran3320]

Any drop in power?

[@MotoMirius]

Not that anyone has ever measured

[@sumanthchowdary9897]

Is there any disadvantages of removing db killer

[@MotoMirius]

If you still have the cat and presilencer there should be little impact on the performance of the bike. Some consider louder to be a disadvantage. Skäl David

[@sumanthchowdary9897]

Moto Mirius sir one more doubt is there any mileage drop

[@MotoMirius]

@@sumanthchowdary9897 Any mileage drop will most likely be the result of you blipping the throttle to hear the engine!

[@entertainments1231]

What's the size of Hole saw used ... ?

[@MotoMirius]

Its in the description ...

[@pflolssa]

Why do you need to keep it if you de-cat? 🧐

[@MotoMirius]

It's a choice, but removing the baffle and the presilencer can lead to loss of mid range torque. If you remove the cat and the presilencer, replacing both with a link pipe then it makes the bike very loud, so depending on where you live, you may wish to keep the baffle so the bike is quieter - otherwise it can make you very popular with the police who will all want to say hello. But if you live somewhere remote, then....

[@רוןממן]

hai. i enjoy watching this channel... I wanted to ask if this video in particular can be applied to duke 690...and if is there a way to get rid of the ugly presilencer.

[@MotoMirius]

Thanks, much appreciated. I'm not familiar with the 690 stock system and not sure how it changed over the years so I can't comment on this particular mod. But there are certainly cat delete pipes out there so I suspect some of those will also delete the presilencer.

[@grumpybraincells6612]

wonder if I can do this on yamaha R3??

[@MotoMirius]

Different exhausts can require different solutions. Have a look to see how the baffle is attached. Skäl. David

[@grumpybraincells6612]

@@MotoMirius I think what I'm gonna do is buy a cheap stock muffler on ebay, then I'll do exactly what you did, if it doesn't work, I guess it's a damage I can live with hhhhh

[@ShaghinPC]

What size is the saw, 40 mm??

[@MotoMirius]

It's in the video description. Make sure that it's a good quality metal saw as stainless is a hard metal.

[@ShaghinPC]

@@MotoMirius ❤️‍🔥❤️

[@108_sahilgaikwad7]

if i remove the db killer will it harm my engine?

[@MotoMirius]

Unlikely, so long as everything else is stock.

[@23nucleab73]

Does it harm engine by removing the stock exhaust Dp killer please do let me know.

[@MotoMirius]

For most people, if it is the only change you have made then no. It's impossible to generalise because it depends if your engine already has a problem or if you live somewhere extreme where the bike is already running at the limit of its map adaptation. If you have a concern then fit one of the basic piggybacks. Bear in mind that KTM sell an alternative exhaust that is louder and more free flowing and KTM are very clear that this exhaust will not harm the engine and does not need any modifications.

[@mightyJudah]

What kind of saw tool is that?

[@MotoMirius]

It's a hole saw. Skäl David

[@scrvlogs4118]

Will it hamper the engine? and should it be done before 3000 km?

[@MotoMirius]

I suggest not before first service. So long as you have made no other changes, this is normally fine. Skäl. David

[@xiaoliubaba]

Hello, I would like to inquire about the model of the hole punch you use, because I am a Chinese duke 390 rider, I do not understand it in the video, so I take the liberty to ask if there is something wrong , Excuse me, because i use google translation. Thank you! !! !!

[@MotoMirius]

Hi and thank you for watching! The hole saw was Bosch but any good saw will be fine. Skäl. David

[@xiaoliubaba]

Moto Mirius Thank you for your reply. I personally learned that it is a bosch hole opener, and also observed a 40mm diameter hole opener, but thank you for your reply! !! !!

[@premjithps9721]

It is possible in interceptor

[@MotoMirius]

I don't know, I don't have one.

[@bruterohan.390]

it will effect bike engine or not

[@MotoMirius]

KTM state that fitting the Powerparts Akrapovic slip on requires no changes to the engine - this does not have a bigger effect than fitting the Akrapovic

[@bruterohan.390]

@@MotoMirius thank you❤️

[@abdallahbidawy2211]

what kind of hole saw is that?? tried a regular metal one...the blades became round and fluffy! haha

[@MotoMirius]

You are cutting into stainless so cut slow with lubricant. And yes, use a decent quality saw because stainless is hard. Also make sure its as large as you can fit to avoid the weld because this is thicker.

[@raffaelerusso1756]

Does it works also on husqvarna 701 stock exhaust?

[@MotoMirius]

I've not seen a 701 exhaust in person. The chances are that something similar would work. Skäl David

[@TheJWC56RSA]

Very informative as always. Thanks David. Why would you keep the baffle when you decat? Regards.

[@MotoMirius]

Because the decat makes the bike a lot louder. It depends where you live but I have to keep the baffle in on my Akra because otherwise it would be a police magnet 😂😂. Skäl. David

[@jakedeadmon1183]

I have the full cat and premuffler delete with the db killer installed and it's too loud now. Take out the baffle and it would sound like a straight pipe.

[@DarioTelloLab]

Hi , does this change improve or worsen the bike's performance? I know that removing the db-killer changes the carburetion

[@MotoMirius]

Removing the DB killer will alter the carburetion but for most applications within the existing KTM fuel map. It is impossible to guess exactly what the effect will be for your bike. There are many variables which affect carburation and performance including fuel and altitude which would change the actual impact on your bike compared to mine, however if you are running a stock exhaust then I think you are overthinking this. Skäl David

[@roxd390]

Removing db killer will cause any harm to engine or power drop in future??

[@MotoMirius]

Not if its the only thing you've done.

[@azharmohammad3518]

Had any one tried older version exhaust on 2017 duke 390? Wondering how it sounds!

[@MotoMirius]

It has been done. It sounds exactly like a pre 2017 Duke! Skäl. David

[@azharmohammad3518]

Could you please share that link, if possible

[@davidwaddington9414]

is it still illegal to remove the baffle ?

[@MotoMirius]

Depends where you live. Legislation tends to be about sound levels not whether it has a baffle in or not - the PowerParts replacement is about the same sound level as this with the baffle removed - and that isn't illegal. Generally though it's about the legality but how the laws are enforced. I cannot over emphasise that you are almost certainly over thinking how loud this is - the bike has a cat and a presilencer that do most of the noise reduction - this is a tweak.

[@rebecca1610]

Great video. I did this a couple weeks ago to my 2020 duke 390 and it sound great. I just bought a Powertronics piggyback ECU and am wondering if I need a dyno tune or can I use the map they already have installed? This is the only mod I’ve done but I’m considering the Coober air box lid at some point.

[@MotoMirius]

Thanks. Their standard map should be fine. PowerTronic do great modules but you really need to be sure that the map matches your configuration. I would recommend the mapped units like that for more developed builds where you are looking to build power and know what you are doing. Skäl. David

[@rebecca1610]

Moto Mirius Which would you recommend I use instead of PowerTronic?

[@MotoMirius]

If you have the PT then use it but check that the supplied map works with your configuration. Normally this is OK but mapped units are better for track day and power builds. For street use where you are not monitoring the bike then something like a RapidBike Evo Exclusive is better in my opinion.

[@TheCoooool123]

Volume normalization and that's the first time I've heard someone call it a-crap-o-vich 😂👌

[@MotoMirius]

Volume is now beyond my ability to correct, but at least you now know how the manufacturer pronounces it!

[@manuelmielczarek5107]

Why u don’t take out exhaust first, does do this on bench and after work just take on moto if u does it to throw out dB killer?

[@MotoMirius]

Because the bike is the best jig to hold the exhaust without damaging by trying to clamp it down on the bench. You don't really need to remove it to pull out the DB killer - it is possible to pull it out with a wire etc - but you will then need to be aware that it will fire all the metal cuttings out when you start it. Skäl David