M4 Muffler Box Eliminator Kit

M4 Muffler Box Eliminator Kit
M4 Muffler Box Eliminator Kit

$179.00 $199.00
10% Off - Save $20.00

Item #MPE000I

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15 Reviews
4.8 out of 5 stars
5 Star   15 4 Star   3 3 Star   0 2 Star   0 1 Star   0
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All Reviews
Julio Verified Purchaser
Great Purchase

For the price you can't beat it. It sounds great ( loud as heck with the gp slipon ) gives my r6 a nice deep rumble that turns heads everywhere I go.

VDUB87 Verified Purchaser
Best upgrade for sound system!

The first experience purchasing with the company is great. The shipping was fast in receiving the cat delete y-pipe pipe. The installing was little long but worth it for the remarkable sound that comes out of it. I will recommend this product to other buyers for loud sound to there bike.

Dexter Verified Purchaser

amazing customer service. easy to install. takes a good deal of weight off the bike. sounds GREAT. good quality product overall. oh and shipped super fast! great job guys.

kkr6 Verified Purchaser
Weatherford, TX, USA

It was a little tricky to get on just right considering I did not take off whole exhaust system(headers). Took about 4 hours and lots of careful grinding and went on finally. Very loud. I took a 1 inch wood hole
drill and drilled out my cats as well. You will need a power commander.

Sturg Verified Purchaser
Love it

Easiest and most afforadable way to make a full exhaust. Sounds even better with the stock slip on. Great product. I had mine Tig welded and definitely recommend doing it that way. Thanks!

M4 Muffler Box Eliminator Kit
Great Purchase

installed it on my R6 2015, , very good quality of the product ,easy install , sounds amazing even with the stock exhaust , not to mention weight loss .
very hapy with the purchase.


My bike sounds so much better and runs so much smother now

BrileyR6 Verified Purchaser
Best buy for a R6

I am very happy I decided to buy this m4 mid pipe it's the best purchase I have made. The quality was A++ very good welds and it fit perfect without any extra work. Once I put the M4 slip on with it unleashed the beast it's so loud and sounds so mean! I am constantly being told that it sounds amazing and it's so loud! When I ride with my buddies it completely drowns there bikes out. I am very pleased with my ice . If you want to open up your bike this is what you need. You won't be disappointed at all!!!!!!

Dave Verified Purchaser
M4 Muffler Eliminator for Yamaha R6

This product has extraordinary build quality (VERY good welds), and fitment was perfect. It is slightly easier to install on the older models (2006), because at some point, Yamaha started welding on extra supports to the pipes in the newer models (2013), which need to be ground off after cutting the box off. You may want to source an older pipe on eBay to use for this project if you have a newer bike, or just take your time and grid down the welds. Once installed, it sheds a fair amount of weight (about 10 lbs or so), and gives much better airflow. I used it with the Akrapovic Megaphone slip-on, and it is loud, but not deafening due to a small amount of honeycomb material inside the pipes which help muffle the sound slightly.

I would highly recommend removing the air pump assembly and using block off plates, in order to keep it from backfiring and popping on deceleration. Also, to get the most out of it, I would recommend a fuel management system such as the Power Commander V, and if you don't have access to a dyno, use their auto-tune kit with it.

Pipe Comparison
Ronny Top 250 Contributor Verified Purchaser
2008 R6

This mid-pipe is an awesome exhaust upgrade, it opens up the exhaust and with a tune will add a few horsepower.

The exhaust is a little raspier than before and pops sometimes when shifting and decelerating, but this should be expected when deleting a cat and muffler. I left my stock exhaust flap in and functioning along with my 02 sensor, no codes and the bike is running well, however I am getting the bike tuned with a PC3 this weekend to make the most of the mod.

the install is not super easy and will require cutting and grinding some parts smooth to get the fit right with no leaks, I would also order oem header gaskets because the headers should be removed to install this.

the welds and materials used appear to be top notch as well.

Aaron Verified Purchaser
Excellent Quality product

The M4 midpipe is of the best quality and design I have seen. The bends are way smoother than any other brand I have seen. You can tell alot of time went into the design. The welds are excellent and is very sturdy. The install requires cutting of the stock header which can be done with a hacksaw but a sawzall or chopsaw would be the easier option. Well worth the time even if using a hacksaw. I have a graves slipon with it and it sounds great. Its louder and deeper than stock but not loud enough to need earplugs.

Pawtucket, RI
This is a Review on M4 Midpipe and M4 Slip-On


I have the M4 Slip-On connected to the M4 Mid-Pipe..Obviously you can go get a MUCH better slip-on out there that produces more power and torque..But if your not looking to get a Full Exhaust YET. I recomend not just getting the M4 Slip-On, cuz you will notice a very slight difference in sound and maybe a gain of 1HP..If you delete the cat with the M4 Mid-Pipe with it, you are saving about 12LBS, It sounds GREAT, and I gained 8HP on dyno and a TON of torque..But on a cool day with right conditions, you can gain up to 10HP!!!..Now with the Slip-On being $239 and the Mid-Pipe being $179..Your getting descent gains for $420..Not as much gains as you would with a full M4 exhaust..But about 75% of the gains a full system would give out BUT a full M4 system is $879-$900...And the Midpipe and Slip-On takes MINUTES to install, where a full system, you would maybe want to take to a mechanic to make sure everything is sealed 100%, but even if you did it yourself, your talking around 2 hours work.....LOL SO TO END MY RANT, IF YOUR LOOKING FOR DESCENT GAINS FOR LESS MONEY AND ALOT LESS AND EASIER LABOR, GET THE M4 SLIP-ON WITH THE M4 MIDPIPE!!!...ME PERSONALLY, I WOULDNT GET A SLIP-ON UNLESS YOU HAD A MID-PIPE, CUZ IF YOU DO THAT, YOUR JUST DOING IT FOR LOOKS, IT REALLY DOES HARDLY ANYTHING ASFAR AS PERFORMANCE AND YOU HARDLY HEAR MUCH OF A CHANGE IN TONE....."

bronx ny
Good purchase

M4 Muffler Box Eliminator Kit
orlando florida

Love the part it bolted on my 2007 yamaha r6 really easy great sound with my akrapovic slip on pipe.Great deal for the money and the welds are outstanding.

Clean product

went together easy and sounds great! very detailed instructions

13 Questions
Answered:   11
Not Yet:   2
Location: Washington, DC, USA
Q: Can I fit a Yoshimura TRC slip on?
3 months 28 days ago
Q: On this product, does it just remove the muffler on the bike, or does it actually remove the cat as well?
4 months 15 days ago
Location: CA
Q: What will happen if I install the m4 muffler eliminator kit but do not tune my bike with a power comander or something similar?
2 years 5 months ago
MotoSport Staff Expert
2 years 5 months ago
A: It most likely will not run correctly. For maximum performance a fuel programmer is recommended.
2 years 1 month ago
A: Once I installed it I felt a small amount of hesitation between shifts, and it will backfire alot when you let off the gas. You eventually will need a fuel management system or the ECU will need to be flashed to accommodate the free slowing exhaust.
Location: st.louis
Q: Custom dyno tune or download tune from pc5?
2 years 9 months ago
I have a 2012 r6 with k&n race filter, smog block off plates, pc5,m4 go slip on, m4 cat delete pipe. I was wondering if it would be best to have a custom map built on the dyno for me or go with one from power commanders website. Any help would be much appreciated.
MotoSport Staff Top 1 Contributor Expert
2 years 9 months ago
A: You should be able to find a good map from Power Commander. If that doesn't work, I would then go the dyno route.
2 years 7 months ago
A: Unless you have easy access to dyno services, I would go for the auto-tune setup for PC5 (I actually did this).
Location: Massachusetts
Q: Do I need to take off the whole exhaust off to cut off the muffler box out or can I leave it on the bike and cut it ?
2 years 10 months ago
Expert Top 1 Contributor MotoSport Staff
2 years 10 months ago
A: Yes, you will need to remove your exhaust system before cutting as recommended by M4.
2 years 7 months ago
A: You will want to remove it for sure, there is grinding you will need to do on top of the pipe, that would be too hard to get to when mounted.
3 months 22 days ago Location: Weatherford, TX, USA
A: You can leave exhaust on bike and cut it off. That's what I did. It just took a total of about 3 hours. (Grinding,cutting,and fitting just right). So yes. You can leave it on. Just be careful and watch oil pan
3 months 10 days ago Location: Columbus, OH, USA
A: You have to take it off. you might get away with cutting it off while still on but to sand it down and clamp/weld it together it defintiely needs to be off. its easier than you probably think though!
3 months 1 day ago
A: Yes you gonna have to take the whole system out to cut the cat off cause you will have to grind off the ends of the headers smooth to get the m4 eliminator to fit right in.
Q: Does this mid pipe eliminate the o2 sensor? or is there a place for the old one to connect? I have a 2006 r6 with Jardine gp1 slip on.?
Over 3 years ago
MotoSport Staff Expert
Over 3 years ago Location: Portland, OR, USA
A: There is a hole on the top of this Eliminator Pipe that would allow the OEM O2 Sensor to hook up to the pipe. I would recommend taking a look at the installation instructions for this Kit before purchasing.

Here is a link to the Installation Instructions for your bike: http://www.m4exhaust.com/products/art/systems/R6-08/YA-MBEKR606-Instructions.pdf
2 years 7 months ago
A: It has a pre-welded bung for the O2 sensor.
Q: Does this come with the slip on clamps?
Over 3 years ago
Expert MotoSport Staff
Over 3 years ago Location: Portland, OR, USA
A: This would come with all necessary hardware (including clamps) for installation. Note: Installation of the Muffler Box Eliminator Kit requires cutting the stock system at the muffler box. This is a simple procedure that is done with common tools. However, before ordering, we strongly suggest you read the complete instructions.
2 years 1 month ago
A: It comes with all the hardware to install it to the header pipes. When you buy the slip on you choose it will come with the clamps to attach it to the mid pipe.
3 months 1 day ago
A: Yes the cat eliminator does come with two clamps to attached towards the headers
Location: Michigan
Q: If i install this on a 2012 r6 do i need to have the bike tuned or use a power commander?
Over 3 years ago
If i install this on a 2012 r6 do i need to have the bike tuned or use a power commander for the bike to run properly?
MotoSport Staff Expert
Over 3 years ago Location: Portland, OR, USA
A: When eliminating the Muffler box on your bike you would more than likely need to re-tune your bike using a power commander for better performance. With this in place of the Muffler Box the exhaust will flow more freely through the system than it did with the muffler box so your fuel/air mixture would have to be tuned to accommodate this change.
1 year 9 months ago Location: Hawaii, USA
A: Anytime you mess with the exhaust it's best to get it tuned so it runes properly. I have a power commander on my bike it's not necessary but it just gave me more of a reason to get it tuned.
3 months 22 days ago Location: Weatherford, TX, USA
A: Use a power commander. If you do not the bike will run extremely lean and not any power at all. Power commander will get it where it responds extremely well to the free flowing exhaust
Location: india
Q: I have r6 and ktm 200 can i fit this exhaust on ktm duke also.????
Over 3 years ago
MotoSport Staff
Over 3 years ago Location: Portland, OR, USA
A: Unfortunately this will not fit on the KTM Duke 200. The Duke 200 is not a US model so we will not carry any parts that are specific to that bike.
Location: San Diego, CA, USA
Q: I have a hot bodies slash cut megaphone slip-on exhaust on my 07 r6 will this kit fit smoothly or will I have to do some cutting?
Over 3 years ago
MotoSport Staff
Over 3 years ago Location: Portland, OR, USA
A: Since this is designed to work with the stock muffler, any standard slip-on muffler should work just fine with it. The only issue is there may be slight manufacturing tolerance issues as the items are from 2 different companies. This shouldn't pose a big problem at all and only slight modifications may be required. Keep in mind on your 2007 R6 you will need to cut the muffler box off in the correct spot. This will then slip over the header and will not require any welding for installation.
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# Part Numbers
Product Variant Manufacturer Part #
M4 Muffler Box Eliminator Kit YA-MBEKR606
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