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BMW M2 Forum > BMW M2 Discussions > S55 Exhaust Sound - Different midpipe - Massive improvement

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      06-25-2020, 04:49 PM   #1
Dasnub
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S55 Exhaust Sound - Different midpipe - Massive improvement

So apparently Active Autowerke has developed a midpipe that solves the awful exhaust note issue caused by the S55. Just saw this video posted and now I hope they make this work on the M2C.



https://store.activeautowerke.com/co...ength-mid-pipe

Last edited by Dasnub; 06-25-2020 at 04:56 PM..
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      06-25-2020, 04:59 PM   #2
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Very long thread on the M3/4 boards:

https://f80.bimmerpost.com/forums/sh....php?t=1675268

Active are actively developing this for the F87 Bottom line: For the M2, it didn't fit.

TopGear Motorworks has a midpipe + axleback system for the M3/4.

It sure does clean things up nicely, doesn't it?
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      06-25-2020, 05:11 PM   #3
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The exhaust note has always been a non starter for me when considering an upgrade to the comp model. This would certainly make it more enticing.
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      06-25-2020, 05:25 PM   #4
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A forum member is running the prototype EL midpipe from Active on his M2C. The thread and sound clips can be found at:
https://f87.bimmerpost.com/forums/sh...1696302&page=6
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      06-25-2020, 05:33 PM   #5
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Quote:
Originally Posted by Dasnub View Post
So apparently Active Autowerke has developed a midpipe that solves the awful exhaust note issue caused by the S55. Just saw this video posted and now I hope they make this work on the M2C.



https://store.activeautowerke.com/co...ength-mid-pipe
Wow I agree! That has to be one of the best sounds from the S55 I've heard! So much so it doesn't even sound like an s55! I'm sold
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      06-25-2020, 07:23 PM   #6
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Quote:
Originally Posted by KevM2 View Post
Wow I agree! That has to be one of the best sounds from the S55 I've heard! So much so it doesn't even sound like an s55! I'm sold
Keep in mind, this guy has the AA midpipe with Titanium M-Performance Exhaust for his M3
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      06-25-2020, 08:33 PM   #7
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Yes it is interesting! would be great to see the final product of the EL midpipe for the m2
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      06-25-2020, 08:40 PM   #8
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I must be missing something as that sounds pretty much the same as a comp model that has the mpe titanium exhaust. Maybe slightly cleaner in the mid range...
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      06-25-2020, 09:02 PM   #9
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Quote:
Originally Posted by quikM2 View Post
I must be missing something as that sounds pretty much the same as a comp model that has the mpe titanium exhaust. Maybe slightly cleaner in the mid range...
“ An inline 6 engine naturally has an evenly spaced exhaust pulse which results in a more smooth and full sounding noise. However, the twin turbo setup of the S55 engine while producing addition power has created a sound which sounds more like 2 independent inline 3's competing for noise than the throaty sound one would expect. The variance between the lengths of the front and rear down-pipes of almost a foot and a half creates unevenly spaced pulses so that when the merge in any form of crossover system whether stock, x-pipes, double x-pipes, single mid-pipe or rear-section solutions. Since the sound waves are moving at the same rate when they exit the system, these crossover sections are simply creating a higher pitched sound resulting in the annoying sound some have referred to as a weed eater sound. The current systems allow the banks to merge unequally pulsed sounds and after much research and testing (from many BMW experts) it was determined that equalizing the length of the exhaust pipes before mixing was a solution to this sound problem.”
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      06-25-2020, 10:28 PM   #10
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How is it that the Dinan exhaust sounds so good without the equal length pipes... I think it's probably one of the best sounds
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