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      07-11-2020, 05:41 AM   #1
yjypm
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Drives: 2018 M3 ZCP
Join Date: Oct 2017
Location: Los Angeles

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AA Equal Length Midpipes with MPE videos

Just received the midpipes to day and immediately got them installed at buddy's shop (for free )

Setup:
MPE
AA EL Midpipes non-res
Stock DPs

My review:

Install:
I am not very experienced in installing exhausts so I might have gotten something wrong during the install. I'd like to first complain that there isn't a diy manual provided by AA and I couldn't find a lot of the torque specs online. We took off the entire exhaust (MPE + stock midpipes) first, mark the cutting lines and installed the exhaust in the order of the equal length part of the midpipes -> connecting pipes -> mpe muffler. Fitment was a bit of an issue during the install, the midpipes, due to the unique shape, were touching the metal shield underneath the car around the exhaust. A lot of wiggle around was applied to make them barely clear the metal shield. After the install, after I took the car for a drive and the exhaust got hot, I could sometimes hear some rattle under 3k rpm and I'm sure it's not my MPE because I have checked for any crack or leak. I might take the car to a shop later next week to check the fitment again.

Sound:
First of all, the volume is definitely louder in both efficient and sport mode. I'd say about 20% more. (I got pullover for exhaust noise right after I left the shop, in efficient mode. The cop was nice enough to let me go with just a warning, I don't think this is a future concern, it was 11:45pm and there seemed to be a large car meet nearby so I understand why he wanted to give me some trouble.)
Second, the burbles are more apparent and aggressive even I'm running very mild burble settings (You will hear the pops and burbles in the video, im running something like 0.6 aggression in BM3).
Third, the fun part, they work! At higher rpm the exhaust is much deeper than before, they turn this fart cannon into a proper I6 machine, no rasp at all at higher rpm except the lift-throttle fart and pops. However, at lower rpm I think there are still some familiar MPE signature rasp, exaggerated by the farts and pops. I might lower the aggression in BM3 more or just disable the burbles all together. It could be the fitment issue I talked about. I will update as soon as I figure this out.

So here are the videos:
We took a few videos with my camera + microphone.
First one was taken in the shop. Startup, Rev in efficient first, and Rev in Sport at 0:20
Second one was taken on the highway. Sport mode, at one point revved to the redline.
The last one was taken with windows down on highway. Nothing especial just a lot of wind noise.

Enjoy and leave a comment and let me know what you think.






——————————————————————————
Update 07/12/2020:
We to the canyons and recorded a video of my car accelerating hard by a buddy
People on ig said it sounds like stock MPE but it's not in reality according to friends, maybe it's because of the phone mic and speaker

IMO there are still rasp no doubt, but I like the cleaness of the sound now. It sounds much more exotic at higher rpm compare to stock mpe, its actually not so embarrassed to pull hard now.
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Last edited by yjypm; 07-12-2020 at 11:35 PM..
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