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      08-07-2017, 08:39 PM   #1
Chicken_Joe
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M2 Muffler mod

Has anyone done the muffler mod on the stock exhaust? I have done it on an F30 M Performance muffler. Gutted the muffler, but left a littler perforation. Sounded great. Although a little metallic with catless. Sound very nice in stock exhaust. Would anyone be interested in something like this if I were to make one?
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      08-19-2017, 11:08 PM   #2
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Quote:
Originally Posted by Chicken_Joe View Post
Has anyone done the muffler mod on the stock exhaust? I have done it on an F30 M Performance muffler. Gutted the muffler, but left a littler perforation. Sounded great. Although a little metallic with catless. Sound very nice in stock exhaust. Would anyone be interested in something like this if I were to make one?
Can you explain the process?
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      08-20-2017, 11:09 AM   #3
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this





Quote:
Originally Posted by S65 Underdog View Post
I was going to say test pipes with ACM mod but that is what I have and it's loud with a rasp after 4k RPM. It's louder because they delete the pipe from crossing in the axel back technically becoming straight pipes. Less resistance so more sound. OEM mod just replaces the perforated pipe with straight pipe.

OEM Mod below. More restriction, less sound.






--------------------



ACM Mod below. Less restriction, more sound.





I have to agree that this modification is loud but if you want PURE RACE CAR then ACM is the route. I love it and everyone I have met loves it. I have had compliments and shocked faces from people who spent thousands to realize they could get an amazing sound from OEM chopped up.

Last edited by AGM2; 08-20-2017 at 11:17 AM..
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      08-20-2017, 02:30 PM   #4
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Quote:
Originally Posted by bi0hazard View Post
Quote:
Originally Posted by Chicken_Joe View Post
Has anyone done the muffler mod on the stock exhaust? I have done it on an F30 M Performance muffler. Gutted the muffler, but left a littler perforation. Sounded great. Although a little metallic with catless. Sound very nice in stock exhaust. Would anyone be interested in something like this if I were to make one?
Can you explain the process?
You literally remove some of the perforated tubing that quiets down the exhaust and replace it with solid tubing
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      08-20-2017, 05:59 PM   #5
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Please do it... did it on my e90m... Someone told me that you can't do it with the m2 exhaust. So it will be great to see it happen ��
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      08-21-2017, 11:04 AM   #6
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I did it on my e92 M3 and it sounded epic. I haven't seen inside a stock M2 box yet, maybe one of the tuning houses that routinely replace these could open one up and take some pics?
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      08-22-2017, 08:07 AM   #7
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Quote:
Originally Posted by DivideBYZero View Post
I did it on my e92 M3 and it sounded epic. I haven't seen inside a stock M2 box yet, maybe one of the tuning houses that routinely replace these could open one up and take some pics?
Maybe quad is fake...will know why the 2 exhaust pipes are black while the other 2 are shiny
Like the 1M's quad is fake...!!!

we need to fund out if this quad box M2 is FAKE NEWS!!!
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      08-22-2017, 06:10 PM   #8
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Quote:
Originally Posted by AGM2 View Post
Maybe quad is fake...will know why the 2 exhaust pipes are black while the other 2 are shiny
Like the 1M's quad is fake...!!!

we need to fund out if this quad box M2 is FAKE NEWS!!!
E92 quad was fake, two pipes went through the box, just the tips split, the same as the M2.
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      03-27-2018, 06:05 PM   #9
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old thread, but I'm going to be doing this (or similar) to my car after my breakin service in 3 weeks

will open up the muffler and let you guys know what may be possible (and hopefully take some pics. been talking to the muffler guys down here in brisbane
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      03-27-2018, 06:15 PM   #10
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This has been done. Someone on this board did it to their Alpine White, sent me pics of the process and it looks clean. His impressions on the sound were good also.
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      03-29-2018, 08:17 AM   #11
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Would you mind sending some pics? would be greatly appreciated
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      03-29-2018, 09:53 AM   #12
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I'm thinking to go with this, next week.

If I pull the trigger I will post the images from the inside of the muffler chamber.
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      03-29-2018, 07:20 PM   #13
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Quote:
Originally Posted by Yellowflash21 View Post
I'm thinking to go with this, next week.

If I pull the trigger I will post the images from the inside of the muffler chamber.
yeah pics please!

yeah i dropped by the local muffler shop and they are quietly confident something can be done, hes just not sure how its designed inside.. unfortunately i wont be able to (dont want to) do it until my break in service, the cars too young to tinker haha
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      03-30-2018, 12:05 PM   #14
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Got my sitting in the garage for 3 weeks now just haven't had time to drop it off @the shop
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      04-13-2018, 01:20 PM   #15
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Anyone else perform the surgery on the M2? Does it drone w/ this?
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      04-14-2018, 06:07 AM   #16
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Quote:
Originally Posted by Z435is View Post
Anyone else perform the surgery on the M2? Does it drone w/ this?
watch this space

I'm going to the shop on tuesday after my break in service on monday
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      04-14-2018, 06:42 AM   #17
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Buu, I have schedule for next Monday morning.
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      04-14-2018, 05:41 PM   #18
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Quote:
Originally Posted by Yellowflash21 View Post
Buu, I have schedule for next Monday morning.
In that case can you please please provide photo of the inside of the muffler on Monday?

Cheers
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      04-14-2018, 09:37 PM   #19
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Originally Posted by Who? View Post
watch this space

I'm going to the shop on tuesday after my break in service on monday
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      04-15-2018, 05:28 AM   #20
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What about a bypass with an exhaust cut out valve on the right side of the rear muffler? Where the pipe attaches to the muffler. Just go pass it to the right exhaust tips? Its a mod I'm considering.

Like the markings on the picture.
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      04-16-2018, 08:56 AM   #21
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Quote:
Originally Posted by MTornberg View Post
What about a bypass with an exhaust cut out valve on the right side of the rear muffler? Where the pipe attaches to the muffler. Just go pass it to the right exhaust tips? Its a mod I'm considering.
My priority will be to keep it looking oem as possible, so containing it within the muffler, cut open from the top
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      04-16-2018, 09:00 AM   #22
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Quote:
Originally Posted by Who? View Post
Quote:
Originally Posted by MTornberg View Post
What about a bypass with an exhaust cut out valve on the right side of the rear muffler? Where the pipe attaches to the muffler. Just go pass it to the right exhaust tips? Its a mod I'm considering.
My priority will be to keep it looking oem as possible, so containing it within the muffler, cut open from the top
Ofcourse, me too.

With the bypass behind the muffler it will look stock yet have a free flow when valve is opened. (Just added a pic to my last post)

With valve closed it will act/sound exactly as stock.
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