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      07-11-2020, 05:41 AM   #1
yjypm
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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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      07-11-2020, 10:01 AM   #2
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Thanks for the review! So even valves closed its 20% louder which caused you to get pulled over?
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      07-11-2020, 10:03 AM   #3
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Sounds cool at full throttle😀, is this the resonated version, thanks
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      07-11-2020, 11:11 AM   #4
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Quote:
Originally Posted by Lt1camaro View Post
Thanks for the review! So even valves closed its 20% louder which caused you to get pulled over?
Yea valves were closed. Cop said that was the reason, i don't know exactly why because 20% louder than stock MPE in efficient isn't necessarily loud by any means
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      07-11-2020, 11:13 AM   #5
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Quote:
Originally Posted by Railgun View Post
Why does that third video even exist.
Haha Idk I recorded it so I posted it anyways
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      07-11-2020, 11:58 AM   #6
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Sounds good, welcome to the club

One thing that I have noticed: Warm up the exhaust, cold start revs won't sound the same as when there's some heat in the pipes. It sounds a bit tinny (you can hear some rasp) if you let her rip even when the car idles for a few minutes. Drive it for a minute or so and it's much smoother.
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      07-11-2020, 12:04 PM   #7
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Quote:
Originally Posted by Kilabyte View Post
Sounds good, welcome to the club

One thing that I have noticed: Warm up the exhaust, cold start revs won't sound the same as when there's some heat in the pipes. It sounds a bit tinny (you can hear some rasp) if you let her rip even when the car idles for a few minutes. Drive it for a minute or so and it's much smoother.
Thanks for the input! I actually felt differently. When the car is cold it sounds alright but when the exhaust gets up to temp maybe due to the expansion it feels like it's rubbing somewhere making metal noises and vibrations at ~2k rpm with throttle.
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      07-11-2020, 12:05 PM   #8
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Quote:
Originally Posted by jballer123 View Post
Sounds cool at full throttle😀, is this the resonated version, thanks
Thanks! This is the non res version.
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      07-11-2020, 12:18 PM   #9
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Quote:
Originally Posted by yjypm View Post
Thanks for the input! I actually felt differently. When the car is cold it sounds alright but when the exhaust gets up to temp maybe due to the expansion it feels like it's rubbing somewhere making metal noises and vibrations at ~2k rpm with throttle.
Sounds like you're having some clearance issues, it took me a while to line stuff up as good as I could, it doesn't fit right.
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      07-11-2020, 12:26 PM   #10
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Quote:
Originally Posted by Kilabyte View Post
Quote:
Originally Posted by yjypm View Post
Thanks for the input! I actually felt differently. When the car is cold it sounds alright but when the exhaust gets up to temp maybe due to the expansion it feels like it's rubbing somewhere making metal noises and vibrations at ~2k rpm with throttle.
Sounds like you're having some clearance issues, it took me a while to line stuff up as good as I could, it doesn't fit right.
Took us around 2 hours and I think it's still rubbing somewhere
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      07-11-2020, 03:29 PM   #11
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So there are 3 MPE running around with the thing now!

I didn't have any fitment issue with my MPE. Just pushing up the shield here and there, putting washers between cross brace and chassis, and left exhaust tips almost touching the bumper which I will need to try readjust.
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      07-11-2020, 03:34 PM   #12
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Tbh I donít think it sounds too different from a normal mpe based on these videos
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      07-11-2020, 03:50 PM   #13
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Quote:
Originally Posted by MyFragileHalogen View Post
So there are 3 MPE running around with the thing now!

I didn't have any fitment issue with my MPE. Just pushing up the shield here and there, putting washers between cross brace and chassis, and left exhaust tips almost touching the bumper which I will need to try readjust.
I did notice that. My left tips are where they sit previously but right tips are lowered by 1/4 inch
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      07-11-2020, 03:52 PM   #14
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Quote:
Originally Posted by aBMWfan View Post
Tbh I don’t think it sounds too different from a normal mpe based on these videos
Sorry the videos don't do justice. In person it sounds very different. Down low you can still recognize the MPE noise but up top it's completely different
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      07-11-2020, 04:18 PM   #15
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https://vimeo.com/437475875

There is a higher overtone that is sweet which comes audible at around 4k and then gets dominated by the lower tone again. Quite loud and raspy here.
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      07-11-2020, 04:32 PM   #16
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Quote:
Originally Posted by MyFragileHalogen View Post
https://vimeo.com/437475875

There is a higher overtone that is sweet which comes audible at around 4k and then gets dominated by the lower tone again. Quite loud and raspy here.
Definitely sounds different when the revs build up. I like it. Will be installing resonated on my MPE soon.
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      07-11-2020, 04:42 PM   #17
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Quote:
Originally Posted by Andrae26 View Post
Definitely sounds different when the revs build up. I like it. Will be installing resonated on my MPE soon.
It sounds good when I play the clip with my phone because phone can't play bass frequencies well. If I play it with my hifi speakers that can play down to 20-23hz, that's close to what I hear in the car and it's hard to hear the sweet high pitched tone. Need a high pass filter lol.

Maybe the resonated one will improve it? We will see.

Last edited by MyFragileHalogen; 07-11-2020 at 04:49 PM..
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      07-11-2020, 07:51 PM   #18
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https://vimeo.com/437502378
Showing how pitch changes under light throttle (1st gear).
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      07-11-2020, 08:08 PM   #19
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I feel like I still hear lots of rasp before the turbos spool around 3500 rpm, is that the case in person, i love the tone of it , sounds almost NA 👍
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      07-11-2020, 10:36 PM   #20
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I HATE rasp but I hear nothing like what MyFragileHalogen posted in the first video. Maybe something is touching and causing resonance?
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      07-11-2020, 10:39 PM   #21
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Quote:
Originally Posted by aBMWfan View Post
Tbh I donít think it sounds too different from a normal mpe based on these videos
I'm assuming that you've seen mine.
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      07-11-2020, 11:47 PM   #22
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Quote:
Originally Posted by Kilabyte View Post
I HATE rasp but I hear nothing like what MyFragileHalogen posted in the first video. Maybe something is touching and causing resonance?
I agree. I drove the car for 30 miles today and I could feel added NVH and tinning noises. Something is rubbing/touching for sure
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