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M2 Technical Topics > S55 Engine / Drivetrain / Exhaust / Bolt-ons / Tuning > AA Equal Length Midpipe (stock muffler and downpipes)

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      12-19-2023, 07:57 PM   #199
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Originally Posted by NPTM View Post
I spoke with AA about this fitment issue. I legit watched every install video, read the instructions 10x and had a printed copy next to me before my cuts. Followed EXACTLY as they said, and still had some odd fitment (one side perfect, the other side 1/2” short in one spot. They’re explanation was that the factory welds are slightly different on each stock exhaust. I get that, but my bigger issue was how vague the instructions were on WHERE to measure the weld from and where exactly to mark the pipe. This small nuance can make a BIG difference, and I think it’s something they really need to get more specific about in the instructions. Were all detail oriented on these installs, and that part was just sloppy and too vague for what’s the most important (and stressful) part of the install for most of us.....
100% agree. I don't understand why they don't specify measurements like they do for the M Performance exhaust for example. Measuring from the recess mark on the factory resonator seems like it would be more exact than "measure from the weld"
As you stated, it just leaves way more margin for error being very dependent on which weld point you measure from.
Without a doubt it sounds great so far, but having to go through all these additional cycles to fine tune so it doesnt melt the diffuser or in my case getting resonated connecting pipes that don't even fit is super frustrating. I was just fortunate I had both the non-res and resonated pipes at time of install
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Last edited by MSH_; 12-19-2023 at 08:18 PM..
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      Yesterday, 05:56 PM   #200
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Hey y'allllll

I know its been YEARS and I'm not sure who still checks the forums and/or is still running the EL+stock everything else setup ... but does anyone feel like ever since installing the midpipe you've stopped hearing WHOOFs/WHOPs on aggressive / high rev upshifts?

For me the upshift sound seems very similar to the sound the car makes when you let off the gas - the fart sound -- or the braap sound? I'm not sure if the BRAAAP sound everyone talks about is the same sound as the liftoff sound. It's been over 3 years since I last heard the stock exhaust!

You can sort of see what I mean in the first video I included way back in the first post. At 30-31 seconds I do a high-rev upshift and it makes a sort of BRAP / SNAP sound but its very different to a faint memory I have of when the car was a new where in that scenario it would make a POP/WHOP sound.



Here's another example taken from a video I recorded in 2022:



To me the upshift sound seems almost the same as the off-throttle sound at the end.

Anyways none of this is a new occurance. These are the same sounds the midpipe has made since the beginning when combined with stock downpipes and stock muffler. It's taken me a long time but I think I've come to the conclusion that the midpipe has forever removed the WOOF/WHOP that brought a spontaneous grin to my face the first time I heard it on the stock setup.

Don't get me wrong - I think the benefits of the EL midpipe (those sweet sweet sounds as you go up the revs) still make it a worthwhile upgrade and I have no regrets, but I do miss the WHOP/WOOF and frankly the upshift sound and lift-off sound are not ones I particularly care for. The lift-off sounds a bit raspy to me and/or is lacking some body/depth to it.

For those of you who have paired the EL with a different muffler ( No_curebimmer and others) I'm wondering if you've gotten the WHOP/WOOF back or whether the sound is still similar to what is in the videos above.

Last edited by ESB; Yesterday at 06:04 PM..
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      Yesterday, 08:25 PM   #201
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Quote:
Originally Posted by ESB View Post
...... does anyone feel like ever since installing the midpipe you've stopped hearing WHOOFs/WHOPs on aggressive / high rev upshifts?.......At 30-31 seconds I do a high-rev upshift and it makes a sort of BRAP / SNAP sound but its very different to a faint memory I have of when the car was a new where in that scenario it would make a POP/WHOP sound.
I'm running same set up as you and I honestly dont recall the "WHOOFs/WHOPs" on high rpm upshifts, but I guess I'm different, in that, I love the CRACK on the high rpm upshift with the midpipe!

I think I'm definitely moving to an aftermarket exhaust and was going to go Dinan with that crazy closeout price they had going but my order was cancelled, so I'm set on just going with Active's exhaust since they redesigned the resonated connecting pipes recently to mitigate the rubbing issues so many people had. Anyway, I certainly hope I dont loose the crack as I definitely like it
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