[Fasteddy1]

I recently picked up and M2 exhaust to install on my M240i. I kind of took a gamble because I was unaware of anyone else doing this and I was not sure exactly how it was going to fit. I figured that no matter what I would end up with a quad tip exhaust which is what I think this car really should have.

I was hoping I could cut the pipe where one would cut for an M performance muffler. I tried that and it was not even close. I realized that the M2 pipe is quite a bit different and more direct than the M240 pipe.They end up coming together at roughly the same spot forward of the resonator. The resonator on the M240 is almost twice the size of the one on the M2, which I believe is the same as the M235.

Here is a picture of the M2 exhaust on top of the M240:


As you can see the M2 pipe is quite a bit straighter. The M2 muffler is also quite a bit narrower. After working through this I realized that the brackets that support the mufflers have different part numbers and are different.



The M240 bracket is on the top and the M235/M2 bracket is on the bottom. Unfortunately I had to purchase these new from the dealer and even with a discount they were $45 each. But once I got these brackets everything lined up nicely.

Part #'s:

Right 18307620317
Left 18307620316

I welded everything back together where I had cut it initially and then welded it in place in front of the resonator.

It was quite a bit of work but I managed to combine and M2 rear diffuser with an M240 diffuser. I am considering this my first prototype on this because it did not turn out quite as nicely as I had hoped. It looks really good but does not fit quite right in the middle where is snaps in place.





Also to make everything fit I had to fabricate a simple right angle bracket between the heat shield and the new diffuser to support the diffuser in the middle.

I would say the sound is roughly 20 to 30% louder and deeper than stock. In comfort mode it sounds quite similar to the 240 but a little bit louder. In sport mode it is quite a bit louder and there is lots of burbling on deceleration and down shifts. I would say it sounds closer to an M2 than an M240 now.

At idle it is quite a bit deeper and richer sounding.

If anyone else wants to do this I can certainly offer some advice. You would need to get the brackets and have somebody weld it together up in front of the resonator. I would not just clamp it there because the pipe is not supported in either direction for quite a distance.

There may also be some other quad tip diffusers out there that you could buy off-the-shelf and would fit. Perhaps someone will manufacture one.

After I make my next diffuser I may look at bringing it to a friend of mine who could make some molds of it out of carbon fiber.

I also think I picked up a little power with this as well. I have snapped of a 3.8 0-60 time with it. I did not have the laptimer app working before so I have no direct comparison.


Here is the video:

https://youtu.be/6POMUR78UKU

Pat

[jpnh]

Cant wait to hear what it sounds like once you post a vid (hint hint)

Just a thought, from a distance it looks like the exaust tips from the M240 could be welded into the muffler body of the M2 exhaust in order to avoid the need to modify the diffuser

Did you get the M2 exhaust new or used?

Cost?

[Fasteddy1]

Originally Posted by jpnh

Cant wait to hear what it sounds like once you post a vid (hint hint)

Just a thought, from a distance it looks like the exaust tips from the M240 could be welded into the muffler body of the M2 exhaust in order to avoid the need to modify the diffuser

Did you get the M2 exhaust new or used?

Cost?

I suppose you could do that, but I don't think it would sound the same. The M2 tips are kind of chambered and don't come out of the muffler symmetrically.

I got it used on the forum here from M5monster, great guy and seller. I think he has another on here now for $500 shipped:

http://www.2addicts.com/forums/showthread.php?t=1353907

Pat

[M5 Monster]

Awesome work man looks and sounds great.
Do a video in sport mode vs Comfort mode.

[qballis]

Originally Posted by Fasteddy1

I recently picked up and M2 exhaust to install on my M240i. I kind of took a gamble because I was unaware of anyone else doing this and I was not sure exactly how it was going to fit. I figured that no matter what I would end up with a quad tip exhaust which is what I think this car really should have.

I was hoping I could cut the pipe where one would cut for an M performance muffler. I tried that and it was not even close. I realized that the M2 pipe is quite a bit different and more direct than the M240 pipe.They end up coming together at roughly the same spot forward of the resonator. The resonator on the M240 is almost twice the size of the one on the M2, which I believe is the same as the M235.

Here is a picture of the M2 exhaust on top of the M240:


As you can see the M2 pipe is quite a bit straighter. The M2 muffler is also quite a bit narrower. After working through this I realized that the brackets that support the mufflers have different part numbers and are different.



The M240 bracket is on the top and the M235/M2 bracket is on the bottom. Unfortunately I had to purchase these new from the dealer and even with a discount they were $45 each. But once I got these brackets everything lined up nicely.

I welded everything back together where I had cut it initially and then welded it in place in front of the resonator.

It was quite a bit of work but I managed to combine and M2 rear diffuser with an M240 diffuser. I am considering this my first prototype on this because it did not turn out quite as nicely as I had hoped. It looks really good but does not fit quite right in the middle where is snaps in place.





Also to make everything fit I had to fabricate a simple right angle bracket between the heat shield and the new diffuser to support the diffuser in the middle.

I would say the sound is roughly 20 to 30% louder and deeper than stock. In comfort mode it sounds quite similar to the 240 but a little bit louder. In sport mode it is quite a bit louder and there is lots of burbling on deceleration and down shifts. I would say it sounds closer to an M2 than an M240 now.

At idle it is quite a bit deeper and richer sounding.

If anyone else wants to do this I can certainly offer some advice. You would need to get the brackets and have somebody weld it together up in front of the resonator. I would not just clamp it there because the pipe is not supported in either direction for quite a distance.

There may also be some other quad tip diffusers out there that you could buy off-the-shelf and would fit. Perhaps someone will manufacture one.

After I make my next diffuser I may look at bringing it to a friend of mine who could make some molds of it out of carbon fiber.

I also think I picked up a little power with this as well. I have snapped of a 3.8 0-60 time with it. I did not have the laptimer app working before so I have no direct comparison.


Here is the video:

https://youtu.be/6POMUR78UKU

Pat

Can you give us the part numbers for the hangers you needed?

I'm assuming I'll need the same hangers to put 235 m performance exhaust on my 240?

Thanks!

[Fasteddy1]

Originally Posted by qballis

Can you give us the part numbers for the hangers you needed?

I'm assuming I'll need the same hangers to put 235 m performance exhaust on my 240?

Thanks!

I updated the post with the hanger part #s.

I don't think the 235 m performance muffler will fit. The pipes are way different in that area.

Pat

[evancross]

I updated the post with the hanger part #s.

I don't think the 235 m performance muffler will fit. The pipes are way different in that area.

Pat

I can confirm that the M235i Muffler WILL NOT fit on an M240i. The M235 muffler is about 2 Inches shorter hanger to hanger and the pipe into the muffler is bent differently. I have spent way too long messing around with it after reading other members posts saying it fits....

[MichalM240i]

Wow! That's cool mate. Didn't know there is already F87 diffusor style for F22.. If you paint it in the blue/matte black M2 style, i would look damn good.

[42395_skyline]

Looks good so far. I'm really interested in the diffuser, style looks great. How did you get that together? I have a spare M235i bumper that I am going to modify for quad tip. Just still looking for quad tip styles that I want.

[wntrsnowg]

What is the PN on the M2 diffuser you used? How did you modify it to fit? TIA

[Fasteddy1]

Originally Posted by 42395_skyline

Looks good so far. I'm really interested in the diffuser, style looks great. How did you get that together? I have a spare M235i bumper that I am going to modify for quad tip. Just still looking for quad tip styles that I want.

Originally Posted by wntrsnowg

What is the PN on the M2 diffuser you used? How did you modify it to fit? TIA

I started with a stock M2 and a regular 2 series diffuser. I basically cut up the two series one to fit the M2 one on it. It took a lot of specialty adhesive and time to do. If you don't have extensive auto body experience I would not recommending attempting it.

Pat

[wntrsnowg]

Originally Posted by Fasteddy1

I started with a stock M2 and a regular 2 series diffuser. I basically cut up the two series one to fit the M2 one on it. It took a lot of specialty adhesive and time to do. If you don't have extensive auto body experience I would not recommending attempting it.

Pat

I don't have auto body experience but I am pretty handy. How did you deal with the stock m240/235 diffuser being painted? Did you sand down to the plastic, then do the attachment via adhesive, then sand the adhesive more, then reprimer it? What adhesive did you use?
In the FP you said this was a first attempt and you'd make more... Any more details on that?

[Fasteddy1]

Originally Posted by wntrsnowg

I don't have auto body experience but I am pretty handy. How did you deal with the stock m240/235 diffuser being painted? Did you sand down to the plastic, then do the attachment via adhesive, then sand the adhesive more, then reprimer it? What adhesive did you use?
In the FP you said this was a first attempt and you'd make more... Any more details on that?

You will need a grinder, air saw. DA sander, spray gun sandpaper and an adhesive gun to use this:https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

and thishttps://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

You will also need polyolefin adhesion promoter, primer and paint. This is not a simple process.

I am planning on making another one as this one does not fit perfect.

I do have a friend that does carbon fiber molds. I might have him look at making one out of that.

Pat

[wntrsnowg]

Cool keep us posted. I'd be interested especially since there isn't anything available aftermarket right now. Repped

[JamesTabletop]

Ever take your car to any local events? I'm in MPLS and would love to hear how your mod sounds.

[42395_skyline]

Originally Posted by Fasteddy1

I started with a stock M2 and a regular 2 series diffuser. I basically cut up the two series one to fit the M2 one on it. It took a lot of specialty adhesive and time to do. If you don't have extensive auto body experience I would not recommending attempting it.

Pat

If you ever end up making a few of these depending on price I would be really interested.

[wntrsnowg]

Originally Posted by 42395_skyline

If you ever end up making a few of these depending on price I would be really interested.

Same for me

[Fasteddy1]

Originally Posted by JamesTabletop

Ever take your car to any local events? I'm in MPLS and would love to hear how your mod sounds.

Not yet. I may go to cars and coffee this spring.

Originally Posted by 42395_skyline

If you ever end up making a few of these depending on price I would be really interested.

Originally Posted by wntrsnowg

Same for me

I will let you know if it is feasible to make more.

Pat

[Bee Pee]

Originally Posted by Fasteddy1

Here is the video:

https://youtu.be/6POMUR78UKU

Pat

Seems like a lot of work for what sounds like not much gain over stock - at least you have yr M240i ready to install an M2 MPE if you choose to upgrade further !!!

[Fasteddy1]

Originally Posted by Bee Pee

Seems like a lot of work for what sounds like not much gain over stock - at least you have yr M240i ready to install an M2 MPE if you choose to upgrade further !!!

The video does not do it justice. It sounds a lot different, louder and deeper.

Pat

[wntrsnowg]

Way more gurgling than stock, I like. Sounds like the video was shot with a cell phone as the microphone isnt good enough to pick up the true sound

[mike@x-ph.com]

Sounds good