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      02-11-2012, 12:40 PM   #1
RO_Turbo
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REVIEW: Bypass OEM Exhaust Mod

Hey Everyone,

After researching the OEM mod on here, I decide to have it done to my E93 M3 and wanted to take this opportunity to do a quick write up on my experience. I spend most of my time in between the GTA area and Upstate NY area so I had the option of getting it done either in Canada or the US. The next step was to get more information from local shops on either side of the border. I got in touch with shops as far as 4-5 hours away from me and ultimately decided to go with Bimmersport Automotive, located in Mississauga, ON.

Right from the start, the communication was smooth and Jon was always very prompt with replying and answering questions. They hadn't done this ACM inspired mod before but I had a good feeling about the quality of their work especially after having read so many positive reviews about them and having friends who trust them completely to care for their BMWs.

I decided to go with the ACM version which involves bypassing the entire center chamber completely. Bimmerpost was able to do a slightly modified version of this ACM mod and as you can see from the pics they posted, they did a very nice clean job. In my opinion the difference in sound is NIGHT and DAY. There are individuals who have posted that similar versions of this mod give you only ~25% increase in sound at revs >3000. I would say that my exhaust is at least 50% louder now at >3500 rpm and 100% louder > 4500 rpm. Have not really rev'd the car up to 8000 yet as she's still a baby with less than 2500 miles.

At revs below 2500 rpm, there is very little difference in sound compared to the unmodified OEM exhaust. The most noticeable difference to me was not just the loudness but also the exhaust note of the car. It really does sound exotic and as others have said, you really have to hear it in person! They had an E90 M3 with an Active Autowerke Signature exhaust system and in comparing exhausts, the OEM exhaust mod seemed just as loud but with a deeper howl to it. The total job took longer than we had anticipated because we had to wait for the paint guy to arrive with the paint. I would say if you plan on waiting around like I did, to give yourself 4-5 hours.

I have not driven the car since the drive back, but on my 45 min car ride back I didn't noticed any drone. Sound quality inside the car is definitely more pronounced as you are cruising along the highway but definitely manageable and not overpowering.

I’m very glad I decided to get this done and thanks again to Jon, Charlie and the rest of the Bimmersport Automotive guys! I know there are quite a few of you on here especially in the GTA that are sitting on the fence about having this done. The bottom line is that this is the most well spent money ever on a mod for me and OEM bypass exhaust mod sounds absolutely effing AMAZING!

I will be posting up video clips shortly but if you’re ever in the area and want to have a listen for yourself to decide, feel free to drop me a line.

Last edited by RO_Turbo; 02-11-2012 at 12:51 PM.
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      02-11-2012, 12:43 PM   #2
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Pics of the mod, courtesy of Jon from Bimmersport Automotive!











Last edited by RO_Turbo; 02-25-2012 at 02:13 PM.
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      02-11-2012, 03:11 PM   #3
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Great write up, thanks for this OP.

This is exactly what I needed. Going to reach out to Jon and get this done ASAP.
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      02-13-2012, 04:01 PM   #4
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Videos

Hey everyone,

Here are some before and after videos. Enjoy!

BEFORE: COLD START + REV TO 5500


AFTER 1: COLD START + REV TO 4500


AFTER 2: WARM START + REV To 5500
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      02-25-2012, 01:44 AM   #5
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That sounds pretty awesome! Congrats!

How much did Bimmersport charge you for the work?

I'd love to come hear it in person once the snow goes away!

- KJ
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      02-25-2012, 09:24 AM   #6
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Quote:
Originally Posted by KJ
That sounds pretty awesome! Congrats!

How much did Bimmersport charge you for the work?

I'd love to come hear it in person once the snow goes away!

- KJ
In for a meet too.

I think OP is located in Hamilton so maybe meet up in Oakville?

Judging from yesterday's snowmageddon fail, we may be in the clear relatively soon.
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      02-25-2012, 12:01 PM   #7
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Quote:
Originally Posted by Giccy Gic View Post
In for a meet too.

I think OP is located in Hamilton so maybe meet up in Oakville?

Judging from yesterday's snowmageddon fail, we may be in the clear relatively soon.
Maybe a meet on Sat Mar 17th? I'll start another thread to gauge interest.
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      02-27-2012, 02:06 PM   #8
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Quote:
Originally Posted by RO_Turbo View Post
Maybe a meet on Sat Mar 17th? I'll start another thread to gauge interest.
Sounds great. Keep me posted on the meet guys.
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      02-27-2012, 04:43 PM   #9
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It sounds good, but different from mine. I know you did the different OEM mod.
Just for comparison, this is the video from mine and reving to 3000 RPM.



Pictures are attached here (post 25): http://www.m3post.com/forums/showthr...=600991&page=2
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      02-27-2012, 05:08 PM   #10
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Quote:
Originally Posted by Prince_of_Persia View Post
It sounds good, but different from mine. I know you did the different OEM mod.
Just for comparison, this is the video from mine and reving to 3000 RPM.



Pictures are attached here (post 25): http://www.m3post.com/forums/showthr...=600991&page=2
Agreed! Both sound awesome but there is certainly a difference in the pitch once you bypass the center chamber.

It would be cool to have both cars there in person and do a live comparison
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      02-27-2012, 05:20 PM   #11
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Was hoping to see a drive-by vid with the engine under load to really get a sense for exhaust note
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      02-27-2012, 06:21 PM   #12
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Quote:
Originally Posted by RO_Turbo View Post
Agreed! Both sound awesome but there is certainly a difference in the pitch once you bypass the center chamber.

It would be cool to have both cars there in person and do a live comparison
Maybe we can, I drove to vancouver with my M3 last year. Was amazing! Drove to Shannon Falls, such a smooth road with beautiful views. Might do it this year as well.
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      02-27-2012, 06:41 PM   #13
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Here is a cool drive by vid on the center chamber-straight pipe method..wonder how much louder the drive by on your bypass is? Post a vid

Videos are you friend 
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      02-28-2012, 11:13 AM   #14
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Quote:
Originally Posted by Prince_of_Persia View Post
Maybe we can, I drove to vancouver with my M3 last year. Was amazing! Drove to Shannon Falls, such a smooth road with beautiful views. Might do it this year as well.
Haha sure .. but I'm in the GTA/Upstate NY area
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      02-28-2012, 11:16 AM   #15
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Quote:
Originally Posted by tibra1 View Post
Here is a cool drive by vid on the center chamber-straight pipe method..wonder how much louder the drive by on your bypass is? Post a vid

Videos are you friend 
I'll make a video once the weather gets nicer .... but the OEM bypass definitely is louder !!!
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      02-28-2012, 12:57 PM   #16
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Quote:
Originally Posted by RO_Turbo View Post
Haha sure .. but I'm in the GTA/Upstate NY area
Ops lol my bad. Got mixed up with the guy who just did his mod in Vancouver.
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      12-14-2012, 01:41 PM   #17
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I'm assuming that 2.25" piping, correct?

Been looking at doing this mod for local people at a discounted price
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      12-14-2012, 02:42 PM   #18
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Quote:
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I'm assuming that 2.25" piping, correct?

Been looking at doing this mod for local people at a discounted price
No...not 2.25....but 2.5 inch (63.5 mm )
I have done the large perforated pipes mod. myself
See here my post with pics + video vvvvvvv
http://www.m3post.com/forums/showthr...1#post13125366

Last edited by ///M Power-Belgium; 12-14-2012 at 02:54 PM.
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      12-14-2012, 05:42 PM   #19
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Quote:
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No...not 2.25....but 2.5 inch (63.5 mm )
I have done the large perforated pipes mod. myself
See here my post with pics + video vvvvvvv
http://www.m3post.com/forums/showthr...1#post13125366
awesome, glad I asked, I need to order some piping to start working on these for the local guys
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      12-20-2012, 11:38 PM   #20
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Nice welds Charlie.
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      12-21-2012, 12:08 AM   #21
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very nice, only wish that the tips were larger to go with the grunt
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      12-21-2012, 12:56 AM   #22
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love my ACM oem exhaust! you'll notice it only gets even better as it breaks in! Here's my before and after the day i got mine done last month...

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