OEM Exhaust mod [details, pics and vids]

Bart@AUTOcouture · 11-11-2011, 10:50 AM

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

bigtex · 11-11-2011, 11:19 AM

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!

Bart@AUTOcouture · 11-11-2011, 12:02 PM

Quote:

Originally Posted by bigtex

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.

THE TECH · 11-11-2011, 12:15 PM

Quote:

Originally Posted by Bart@AUTOcouture

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.

BMWJ · 11-11-2011, 01:07 PM

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.

bigtex · 11-11-2011, 01:21 PM

Quote:

Originally Posted by BMWJ

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.

BMW Fanatic · 11-11-2011, 01:23 PM

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?

Dave07997S · 11-11-2011, 01:36 PM

Quote:

Originally Posted by THE TECH

I think we're gonna need you to cut open an M Performance to verify this.

LOL...the sacriledge..

THE TECH · 11-11-2011, 01:36 PM

Quote:

Originally Posted by BMW Fanatic

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.

THE TECH · 11-11-2011, 01:37 PM

Quote:

Originally Posted by Dave07997S

LOL...the sacriledge..

HAHA...someone's got to do it right?

BMW Fanatic · 11-11-2011, 01:43 PM

Quote:

Originally Posted by THE TECH

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..

the infamous... · 11-11-2011, 02:44 PM

good shit! luv the tips

Bart@AUTOcouture · 11-11-2011, 02:49 PM

Quote:

Originally Posted by BMW Fanatic

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.

Bart@AUTOcouture · 11-11-2011, 03:14 PM

Video added.

THE TECH · 11-11-2011, 04:13 PM

Quote:

Originally Posted by BMW Fanatic

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

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.

MiamiPerformanceInc · 11-11-2011, 07:35 PM

Quote:

Originally Posted by bigtex

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.

Bart@AUTOcouture · 11-12-2011, 09:04 AM

Another video added, Modded vs OEM.

NYCM3ryder · 11-12-2011, 09:22 AM

I want this done!!! who in NYC can do this for a good price???? lets hear fellas... let me know thanks

Bart@AUTOcouture · 11-12-2011, 09:31 AM

Quote:

Originally Posted by BMW Fanatic

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

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

erm324 · 11-12-2011, 04:04 PM

heard this in person today...sounds ridiculous!!!

elp_jc · 11-12-2011, 08:00 PM

Quote:

Originally Posted by BMWJ

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

.

HoOdRiCh///M3 · 11-13-2011, 09:29 AM

Is there anyone who does this mod in Chicago???????

11-11-2011, 10:50 AM	#1
Bart@AUTOcouture BimmerPost Supporting Vendor Drives: F10 Join Date: Feb 2006 Location: Fair Lawn, NJ Posts: 3,721 iTrader: (4)	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 __________________ Installs\|Service\|Sales - BMW Master Tech on staff! ESS, Akrapovic, Eisenmann, HRE, OEM BMW, Cobb and more! 15-01 Pollitt Drive #6 \| Fair Lawn, NJ 07642 \| P: 201.666.3500 \| Bart@autocouturemotoring.com \| Facebook \| YouTube Last edited by Bart@AUTOcouture; 11-21-2011 at 09:15 AM.
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11-11-2011, 01:23 PM	#7
BMW Fanatic Colonel Drives: slow Join Date: Jul 2009 Location: Calgary Posts: 2,874 iTrader: (9)	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? __________________ Arkym Hood CF, VMR 710 10F 11R, 265/295, OEM Performance Spoiler, Challenge Lip GB, H&R, iND CP, 5/15% tint, MS Air Scoops in Mexico Blue, more coming soon.

11-11-2011, 02:44 PM	#12
the infamous... Lieutenant General Drives: like I'M BOUT THAT LIFE Join Date: Jul 2008 Location: PARADISE aka DAWNTOWN Posts: 16,890 iTrader: (0)	good shit! luv the tips __________________ "simple is clean" -The ///ModFather [ iND ] - [ eAs ] - [ ACM ] - [ LTMW ] - [ AA ]

11-11-2011, 03:14 PM	#14
Bart@AUTOcouture BimmerPost Supporting Vendor Drives: F10 Join Date: Feb 2006 Location: Fair Lawn, NJ Posts: 3,721 iTrader: (4)	Video added. __________________ Installs\|Service\|Sales - BMW Master Tech on staff! ESS, Akrapovic, Eisenmann, HRE, OEM BMW, Cobb and more! 15-01 Pollitt Drive #6 \| Fair Lawn, NJ 07642 \| P: 201.666.3500 \| Bart@autocouturemotoring.com \| Facebook \| YouTube

11-12-2011, 09:04 AM	#17
Bart@AUTOcouture BimmerPost Supporting Vendor Drives: F10 Join Date: Feb 2006 Location: Fair Lawn, NJ Posts: 3,721 iTrader: (4)	Another video added, Modded vs OEM. __________________ Installs\|Service\|Sales - BMW Master Tech on staff! ESS, Akrapovic, Eisenmann, HRE, OEM BMW, Cobb and more! 15-01 Pollitt Drive #6 \| Fair Lawn, NJ 07642 \| P: 201.666.3500 \| Bart@autocouturemotoring.com \| Facebook \| YouTube

11-11-2011, 11:19 AM	#2
bigtex Enlisted Member Drives: 2011 M3 Sedan Join Date: Jun 2011 Location: Southlake, Texas Posts: 37 iTrader: (2)	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!

11-11-2011, 01:07 PM	#5
BMWJ Private First Class Drives: 2011 E92 M3 Join Date: Oct 2011 Location: NY Posts: 162 iTrader: (0)	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.

11-12-2011, 09:22 AM	#18
NYCM3ryder Razzor Drives: JB E90 M3 Join Date: Aug 2010 Location: New York City Posts: 425 iTrader: (0)	I want this done!!! who in NYC can do this for a good price???? lets hear fellas... let me know thanks __________________ 2011 E90, 6 speed, premium package, technology package, winter package, comfort access,19's , EDC, moon roof, matt black grills, 15% carbon tints, ACS roof wing, IND painted reflectors, mfest black gloss m3badges, Mfest side window stickers, Tuner MS 15mm spacers, Carbon fiber M foot pedals, MS air filter, RPI air scoops, euro switch mod

11-12-2011, 04:04 PM	#20
erm324 Major Drives: M3 Join Date: Oct 2009 Location: NYC Posts: 1,048 iTrader: (1)	heard this in person today...sounds ridiculous!!!

11-13-2011, 09:29 AM	#22
HoOdRiCh///M3 Second Lieutenant Drives: LeMans Blue E92 M3 Join Date: Nov 2011 Location: Chitown Posts: 234 iTrader: (0)	Is there anyone who does this mod in Chicago???????

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