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      07-04-2020, 11:11 AM   #5
Flying Ace
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Drives: M6GC ZCP, X5d
Join Date: Jul 2014
Location: SF, CA

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Originally Posted by View Post
Sounds like the exhaust flap(s) rattling. I have aftermarket akrapovic exhaust too, purchased used (2016) M6 & heard this nasty sound from exhaust. after lifting the car & examining the exhaust, I was able to disconnect the little ball joint(actuator) threaded arm (tightened it) & now I hear nothing but that beautiful exhaust note! if your exhaust looks like this, the area in red is where I noticed play (as compared to the other side with no play & no rattle). The arm just pops right off at the ball joint. I then adjusted the green area (outward in my case) untill I had no more rattle.
That is the actuator that opens and closes the valve. I wired mine open. I wasn't aware you can simply remove it, but if you remove or tightened it, it'll keep the valves closed longer.