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      01-11-2020, 06:34 AM   #1
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Exhaust Rattle around 1800 RPM

So I had an Akrapovic exhaust installed about 4 years ago when I bought my M6GC and it's been great. Lately I've developed this tinny rattle noise when decelerating around 1800 rpms as the revs come down. on a downhill where I can hold the rpm, I can sustain the noise for longer than a split second and especially if there's a wall it'll sound absolutely horrible. Dealer checked heat shields but didn't see anything. Could it be the cats going bad? It seems to be more forward than towards the rear and mufflers.

seems to be more prominent when the exhaust is warmed up and is kind of muted when the car is cold especially right now in the winter. Thanks for the help!
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      02-24-2021, 06:41 PM   #2
warrenw
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Did you ever figure out the issue? I have the same problem with my akra exhaust, same RPM, also on decel...
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      03-04-2021, 03:51 PM   #3
hirkaismyname
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Same here -- with the akra. Any help?
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      03-04-2021, 10:03 PM   #4
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The downpipe to midpipe gaskets need to be replaced.
These are crush gaskets which are 1 time use only.
Their only function is to absorb any vibrations. Totally safe to continue driving with this issue until a new set is ordered and installed.
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      03-05-2021, 03:06 PM   #5
hirkaismyname
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Will this work?

https://www.turnermotorsport.com/p-4...uine-bmw-part/
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      03-06-2021, 09:13 PM   #6
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I have the same issue, but for my case I only changed akrapovic muffler, the rattle is there every time
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      03-06-2021, 11:16 PM   #7
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Quote:
Originally Posted by hirkaismyname View Post
Yes! This is the part you need. That rattle drove me crazy until I figured it out.

Quote:
Originally Posted by howe9191 View Post
I have the same issue, but for my case I only changed akrapovic muffler, the rattle is there every time
I'm pretty sure you still have to change that gasket. I don't think the m-performance akra is axel back, it includes the resonator/midpipe which directly connect to the downpipe/catalytic converter with this gasket in between.
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