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      11-11-2011, 10:50 AM   #1
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OEM Exhaust mod [details, pics and vids]

Read a few threads about this and wanted to try it out. There's a few ways people have modded these. Some just pulled out the stuffing in the middle can and wrapped the perforated pipes. Others welded in pipes in place of the perforated ones. We went with another method. Pictures below.

This is what the left and right cans look like inside if you've never seen them. They criss-cross thru the center of the muffler.





We cut out the pipes and re-directed the Y-pipe straight thru bypassing the center of the can.





Last step is to weld on the titanium tips and throw it on the car..



Painted it black..







Video E90 E92 M3 ACM Exhaust Mod vs. Magnaflow and Challenge Sport X-pipe:


Video 2 E90 E92 M3 ACM Exhaust Mod vs. OEM Exhaust:


Video 3 ACM Modded OEM Exhaust E90/2/3 M3
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Last edited by Bart@AUTOcouture; 11-21-2011 at 09:15 AM.
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      11-11-2011, 11:19 AM   #2
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I assume it would have been easier to cut muffler off and run straight pipes to tips. Would this be possible or would there be issues with mounting? If this is possible I would assume it would sound the same and you would realize a nice weight savings. How is the drone? Very nice work by the way!
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      11-11-2011, 12:02 PM   #3
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Quote:
Originally Posted by bigtex View Post
I assume it would have been easier to cut muffler off and run straight pipes to tips. Would this be possible or would there be issues with mounting? If this is possible I would assume it would sound the same and you would realize a nice weight savings. How is the drone? Very nice work by the way!
The great thing about this mod is that fitment is 100% OEM obviously since only the internals are modified. Drone is completely non-existant. Sounds awesome at idle, acceleration and normal cruising. To give you an idea, it sounds a lot like the OEM performance exhaust.
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      11-11-2011, 12:15 PM   #4
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Quote:
Originally Posted by Bart@AUTOcouture View Post
The great thing about this mod is that fitment is 100% OEM obviously since only the internals are modified. Drone is completely non-existant. Sounds awesome at idle, acceleration and normal cruising. To give you an idea, it sounds a lot like the OEM performance exhaust.
I think we're gonna need you to cut open an M Performance to verify this.
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      11-11-2011, 01:07 PM   #5
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this is what I asked in the other thread. it's no different than putting straight pipes from the resonators back. you sound deadening is from 2 sets of cats and resonators only.
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      11-11-2011, 01:21 PM   #6
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Quote:
Originally Posted by BMWJ View Post
this is what I asked in the other thread. it's no different than putting straight pipes from the resonators back. you sound deadening is from 2 sets of cats and resonators only.
This is my assumption as well. I cant wait to hear the video clip. I am surprised with so many exhaust out on the market for this car, no one has producted a simple set of straight pipes from the resonators back with some nice tips. Such as what SLP makes for the C6 corvette. This should be around $500 and IMO would sell like hotcakes.
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      11-11-2011, 01:23 PM   #7
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Any videos?

EDIT - So I'm assuming this exhaust mod can be mated with the other exhaust mod that requires cutting the middle can open and removing the stuffing, correct? Don't you think that would sound bad ass?
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      11-11-2011, 01:36 PM   #8
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Quote:
Originally Posted by THE TECH View Post
I think we're gonna need you to cut open an M Performance to verify this.
LOL...the sacriledge..
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      11-11-2011, 01:36 PM   #9
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Quote:
Originally Posted by BMW Fanatic View Post
Any videos?

EDIT - So I'm assuming this exhaust mod can be mated with the other exhaust mod that requires cutting the middle can open and removing the stuffing, correct? Don't you think that would sound bad ass?
This is the same mod.
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      11-11-2011, 01:37 PM   #10
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Quote:
Originally Posted by Dave07997S View Post
LOL...the sacriledge..
HAHA...someone's got to do it right?
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      11-11-2011, 01:43 PM   #11
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Quote:
Originally Posted by THE TECH View Post
This is the same mod.
But the stuffing is still in the middle can, correct? So how can it be the same mod. That should provide even greater sound enhancements..
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      11-11-2011, 02:44 PM   #12
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good shit! luv the tips
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      11-11-2011, 02:49 PM   #13
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Quote:
Originally Posted by BMW Fanatic View Post
But the stuffing is still in the middle can, correct? So how can it be the same mod. That should provide even greater sound enhancements..
Removing the stuffing out of the middle will have no effect on this mod in this particular instance. We are completely eliminating the flow through the center of the mufflers.
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      11-11-2011, 03:14 PM   #14
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Video added.
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      11-11-2011, 04:13 PM   #15
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Quote:
Originally Posted by BMW Fanatic View Post
But the stuffing is still in the middle can, correct? So how can it be the same mod. That should provide even greater sound enhancements..
Quote:
Originally Posted by Bart@AUTOcouture View Post
Removing the stuffing out of the middle will have no effect on this mod in this particular instance. We are completely eliminating the flow through the center of the mufflers.
The stuffing is only needed when you leave some holes perforated. When you do it like Bart has done, there is no need for it anymore unless you just want the muffler to be nice and snuggly warm.
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      11-11-2011, 07:35 PM   #16
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Quote:
Originally Posted by bigtex View Post
This is my assumption as well. I cant wait to hear the video clip. I am surprised with so many exhaust out on the market for this car, no one has producted a simple set of straight pipes from the resonators back with some nice tips. Such as what SLP makes for the C6 corvette. This should be around $500 and IMO would sell like hotcakes.
Sound like I should get a hold of an M3 and make some exhaust for you guys.
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      11-12-2011, 09:04 AM   #17
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Another video added, Modded vs OEM.
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      11-12-2011, 09:22 AM   #18
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I want this done!!! who in NYC can do this for a good price???? lets hear fellas... let me know thanks
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      11-12-2011, 09:31 AM   #19
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Quote:
Originally Posted by BMW Fanatic View Post
But the stuffing is still in the middle can, correct? So how can it be the same mod. That should provide even greater sound enhancements..
Quote:
Originally Posted by NYCM3ryder View Post
I want this done!!! who in NYC can do this for a good price???? lets hear fellas... let me know thanks
We're 30 mins from NYC, come check us out
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      11-12-2011, 04:04 PM   #20
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heard this in person today...sounds ridiculous!!!
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      11-12-2011, 08:00 PM   #21
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Quote:
Originally Posted by BMWJ View Post
this is what I asked in the other thread. it's no different than putting straight pipes from the resonators back.
IT IS . Remember without the Helmholtz chambers, the M3 drones like a mofo. Those chambers are the little ones immediately after the connecting pipes enter the muffler. VERY effective .

By the way, many folks have done that mod of bypassing the middle absorption chambers, and it's basically the Dinan mufflers' design. Or better put, Dinan just copied the stock exhaust sans absorption chambers ... and couldn't even leave the dual outlets with real tips .
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      11-13-2011, 09:29 AM   #22
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Is there anyone who does this mod in Chicago???????
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