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      02-19-2016, 08:58 AM   #1
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How to modify M performance exhaust to fit with stock bumper

Hey guys, I have a quick question about the M performance exhaust I have for sale. I have the exhaust and chrome tips that I used with the m performance rear diffuser, but I left the m performance diffuser on the car when I traded it.

I have had a few people message me asking if what I have can be used with the stock diffuser. I was under the impression that there was only one m performance exhaust for the M235i and that you had to adjust the tips to make it fit with the different diffusers. However, a few people have messaged me and said there are two different m performance exhausts; one for the m performance diffuser and another for the stock diffuser.

My question are:

1. Are there two different sized m performance exhaust?
2. Is it possible to use the exhaust I have with the stock diffuser?

Thanks for the help guys. I have been trying to search for a while and can't figure it out, and I have a ton of people messaging me and I have no idea what to tell them!
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Last edited by Db750; 02-21-2016 at 07:13 AM..
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      02-19-2016, 09:03 AM   #2
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Well I googled the part number for the exhaust I have and that brought me to a thread that answered my first question! There are indeed two different M performance exhaust! So I guess my only question is can the exhaust I have that is made for the M performance diffuser fit on a car with a stock diffuser?
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      02-20-2016, 08:52 AM   #3
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Yes, but it will stick out further because the MP diffuser sticks out further than the stock diffuser.
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      02-20-2016, 01:13 PM   #4
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Quote:
Originally Posted by RBBuff View Post
Yes, but it will stick out further because the MP diffuser sticks out further than the stock diffuser.
Hey RBBuff,

I appreciate your response. I re-read my question, and I don't think I worded it correctly, or maybe I should have updated the origional question once I realized there were two exhaust.

I understand that using the exhaust that I have with the stock diffuser the exhaust tips will stick out a bit further, so what I am wondering is has anyone on the forum modified the m performance exhaust I have to fit the stock bumper? I have an idea that I think would be very easy, and may be beneficial to those looking to buy or sell an M performance exhaust on the second hand market. I will post an explanation below.
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      02-20-2016, 01:31 PM   #5
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Here is a picture of my M performance exhaust as well as the bottom side of the chrome tip with the hex nut:



Here is a close up of the same. You can see two dots on the exhaust where the hex nut has been set. The one closest to the tip is where they were set while the exhaust was on my car with m performance diffuser, and the second is from me seeing how far back the tips could go before it hit the lip inside the chrome tip.



This picture is of the lip that keeps the tips from sliding back any further on the exhaust:



So it seems to me that it would be very simple for someone to either use a pipe cutter to cut another inch or so off of the exhaust pipe, or have their muffler shop do this thus allowing the tip to slide back further and line up better with the stock diffuser. I know this is not something someone would consider when buying new, but for someone who is buying used and saving a few hundred dollars this would make sense. I would like to know because I have a few potential buyers that have asked this and I would like to give them the best answer.

Has anyone done this, or is there something that I am missing that would make this not work?
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      02-20-2016, 01:59 PM   #6
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Bump. Looking to buy this setup so would like to know if this is a simple fix it would cost $100+ the cost to install it.
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      02-20-2016, 06:40 PM   #7
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Bump again guys. I've got an exhaust bypass that kinda sounds too quiet when the valve is closed and this is a good deal but not sure if can be easily cut to fit a stock 235 diffuser...

Thanks everyone!
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      02-21-2016, 04:30 AM   #8
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Bump!! Had my MPE fitted with stock diffuser yesterday and the tips are sticking out way too far for my liking, makes the car look like a hot rod.

Backbox is mounted as far backwards as possible so the only solution seems to be to cut the pipes slightly shorter as suggested above??
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      02-21-2016, 07:09 AM   #9
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Quote:
Originally Posted by ronnie123 View Post
Bump!! Had my MPE fitted with stock diffuser yesterday and the tips are sticking out way too far for my liking, makes the car look like a hot rod.

Backbox is mounted as far backwards as possible so the only solution seems to be to cut the pipes slightly shorter as suggested above??
Hey Ronnie,

Welcome to the forum! I am glad that you have found this thread. I really think that this could be a valuable resource as more parts become available on the used market.

I am sorry to hear that your exhaust is sticking out further than you would like. Did you purchase yours used or new? If you don't mind it would be a great contribution to the thread if you could take a few pictures of what the exhaust looks like with the stock bumper and post them here as a reference.

I have given this some more thought, and I have revised my method a bit, and now I am 100% sure that it will work, although it will require a little more labor. The only thing we are changing on the car is the diffuser (and more specefically the length that the diffuser sticks out in the back). None of the hardware or mounting brackets are being changed. With that in mind here is the way I would go about fixing your exhaust:

As you can see in this picture the final 2.5 inches or so of the unfinished exhaust pipe are flared out aproximately 1/8 inch. This section fits perfectly inside the lip of the chrome tips, and also allows the set screw to tighten as intended.



What I would suggest doing is cutting a section equal to the length that you would like to move your exhaust tips back out of the skinnier section shown in the below picture, and then welding the original flared end tips back on for a perfect fit of the chrome tips.



The M performance exhaust is very, very easy to mount. My exhaust shop charged me $40 to mount it, and then only $30 to put the stock one back on when I traded the car. The procedure I have outlined above wouldn't cost more than $20-30 IMO, and should give an OEM like fit. As I said, this is not something someone buying the exhaust new should ever consider (unless they bought the wrong one on accident), but as more and more appear on the used market for a good discount this could be a very useful thread.

I would like to hear others thoughts on the above.
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      02-21-2016, 08:36 AM   #10
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Hi Db750,

Thank you for the detailed response, I have attached a couple of pictures of my exhaust as it is currently fitted.

I bought my exhaust new unfortunately but I am still adamant to get it sorted out as its annoying me quite a bit in its current state. As you can see its sticking out quite a lot.


I was wondering however why you suggested to cut the thinner part of the pipe and weld it?

I feel like there is still enough distance in the thicker part of the pipe to simply be cut off at the end by an inch or so and still have enough space for the screw from the chrome tips to be secured on it.

Please let me know your thoughts, Thanks
Attached Images
  
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      02-21-2016, 09:02 AM   #11
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Quote:
Originally Posted by ronnie123 View Post
Hi Db750,

Thank you for the detailed response, I have attached a couple of pictures of my exhaust as it is currently fitted.

I bought my exhaust new unfortunately but I am still adamant to get it sorted out as its annoying me quite a bit in its current state. As you can see its sticking out quite a lot.


I was wondering however why you suggested to cut the thinner part of the pipe and weld it?

I feel like there is still enough distance in the thicker part of the pipe to simply be cut off at the end by an inch or so and still have enough space for the screw from the chrome tips to be secured on it.

Please let me know your thoughts, Thanks
Hey Ronnie,

Thank you for your helpful reply! It is great to see a new member jump in and begin helping immediately! Hope to see you stick around!

My initial fear was that you would need to cut too much of the thicker end pipe back leaving not enough to allow the chrome tips to attach perfectly, and also once the set screw was tightened it might cause the tips to sit at a very slight angle. Basically BMW put that flared end there for a reason, and with the entire length of it in place the chrome tip can slide all the way back with the inside lip of the chrome tip very close to or touching the end of the pipe, and it will fit as BMW intended (although I do think it will have very little if any difference).

Now that I have seen your pictures I see that the exhaust does not stick out quite as far as what I had imagined. I think you are right in that you could just cut from about an inch from the end and it would be more simple (you could easily DIY with a pipe cutter or even a hack saw as it will never be seen with the tips attached). If you look at my picture at the top showing where the set screw hit against the pipe you will see that if you cut off an inch or so of the end pipe the set screw will still be able to rest against the thicker flared end of the pipe rather than having to be screwed in further to hit the skinnier pipe and possibly causing the tip to sit at an angle. Even if the set screw does need to be tightened a bit more to sit against the skinnier pipe I do not think that it will matter as there will still be over an inch of the thicker pipe to insure that the tips sit perfectly straight.

After seeing your pictures I think either method will work perfectly fine, and it is just the choice of the owner based on how he wants it done, how much he wants to pay, and possibly what he is comfortable doing himself in a DIY situation. Bottom line any exhaust shop works with miles of this kind of pipe every day and will have no problem taking care of this for a very small price.

Please let us know which way you end up going as well as how it works out! Hope you are enjoying your M235i!
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      02-21-2016, 11:27 AM   #12
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definitely plan to stick around!

it appears that i was sent the MP exhaust for MP diffuser by mistake which is why it sticks out a fair amount from my stock diffuser.

I'm considering getting it cut as we have been discussing but after a bit of google image searching I'm quite tempted to just bite the bullet and get the MP diffuser too for my car rather than shortening the pipes as i think the diffuser really helps make the rear look more aggressive (one of my biggest problems with the car is how basic the rear looks). Either way i'll keep you updated with pictures!

incredibly happy with the M235 overall though, its my second car and coming from a used 2007 116i and being 22 years old its like a dream come true.

thats quite an impressive collection of cars you own/ have owned by the way!!
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      02-21-2016, 11:35 AM   #13
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Quote:
Originally Posted by ronnie123 View Post
definitely plan to stick around!

it appears that i was sent the MP exhaust for MP diffuser by mistake which is why it sticks out a fair amount from my stock diffuser.

I'm considering getting it cut as we have been discussing but after a bit of google image searching I'm quite tempted to just bite the bullet and get the MP diffuser too for my car rather than shortening the pipes as i think the diffuser really helps make the rear look more aggressive (one of my biggest problems with the car is how basic the rear looks). Either way i'll keep you updated with pictures!

incredibly happy with the M235 overall though, its my second car and coming from a used 2007 116i and being 22 years old its like a dream come true.

thats quite an impressive collection of cars you own/ have owned by the way!!
Thank you, I really appreciate that compliment on my past cars. I started off with the 545i when I was your age, and have been hooked ever since! The M235i is an amazing car especially for a 22 year old!

I ordered the diffuser along with my exhaust which I guess is why I never realized there were two separate exhausts. I agree with you regarding the rear of the car, and I think the diffuser and the M perf tips really make a difference. My 2er was white, so I thought it looked best to have the diffuser painted (picture of mine below), but since your car is black I think it will look great painted or just the matte black it comes in.

M performance diffuser, or cut the pipe a little to make it work; either way you can't go wrong in my opinion!

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      02-21-2016, 11:47 AM   #14
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Bump! Anyone else have this experience? Really want to buy the used exhaust but I don't have M performance diffuser....
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      02-21-2016, 03:32 PM   #15
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      02-21-2016, 10:04 PM   #16
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Quote:
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Do you happen to know the pipe diameter there?
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      02-21-2016, 10:07 PM   #17
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Quote:
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Quote:
Originally Posted by Db750 View Post


Do you happen to know the pipe diameter there?
I do not, but I will measure it tomorrow morning and let you know!
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      02-22-2016, 09:38 AM   #18
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Just forwarded link to my exhaust shop to see if it's an easy fix...
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      02-22-2016, 10:14 AM   #19
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Quote:
Originally Posted by ocN55 View Post
Do you happen to know the pipe diameter there?
Hey, I just measured it, and it is just regular 2.5 inch pipe. The chrome tips fit over it pretty snug. There is probably 1/16" wiggle room.

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      02-22-2016, 10:27 AM   #20
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Quote:
Originally Posted by Db750 View Post
Hey, I just measured it, and it is just regular 2.5 inch pipe. The chrome tips fit over it pretty snug. There is probably 1/16" wiggle room.

Thank you!
Is the stock exhaust also 2.5in?
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      02-22-2016, 10:29 AM   #21
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Quote:
Originally Posted by ocN55 View Post
Thank you!
Is the stock exhaust also 2.5in?
No problem! I do not know what size the stock exhaust is, and I sold the car a few weeks ago so no way for me to check! I did read that the black stock tips are 80mm and the chrome m performance ones are 90mm, but I am not sure if the unfinished pipe underneath is the same size or not!
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      02-22-2016, 04:42 PM   #22
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