Low RPM Drone/Vibration with MPE on 2020 M4 - Bimmerfest - BMW Forums



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F80/F82/F83 M3 and M4 (2015 - Current)
F80 BMW M3 sedan, F82 BMW M4 coupe and F83 M4 convertible forum. This 5th generation M3 and all new M4 features a 3.0 liter twin turbo engine (engine code S55) 425hp and 406lbs of torque! Heavy use of light weight materials makes this generation lighter and faster then the outgoing E9x M3.

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Old 07-22-2019, 05:56 PM
anthony_12347 anthony_12347 is offline
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Low RPM Drone/Vibration with MPE on 2020 M4

Wanted to get some feedback on droning issues I'm having with my M Performance Exhaust on my 2020 M4. I did Euro Delivery with my car, so I did have the opportunity to drive it with the 'stock' competition exhaust. I actually really liked the sound and noticed no drone at all. Was very impressed with the comp exhaust, and expected great things from the MPE when I picked up my car back in Canada.

While the MPE sounds great at high rpms, I've been kind of disappointed as I've been having some pretty awful drone and vibration. It's occurring at 2 very specific rpm ranges:
- The first is just above idle (maybe 1200RPM), very loud and definitely feel a vibration to the point where it's really annoying me.
- The second is during highway cruise at around ~1800-2000RPM in 7th gear in the DCT.

This highway cruise isn't really bothering me as I can always shift up to 6th and it disappears, but the drone above Idle is there at every single acceleration from a stop. Dealer said to give it some time to break in, but wanted some opinions on if this is normal?

I did a quick visual inspection and all the clamps seem good. I still have ASD on, am planning to pull the plug on it this weekend and hoping that makes some difference?

On another note... as MPE was included in my ultimate package, I didn't get the stock competition exhaust back from the dealer. I'm a little worried that if I do want to go back to Comp, I'll have to buy the entire mid-pipe as well since the original resonator was cut out. Can anyone else confirm that?

Thanks.
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