Quote:
Originally Posted by CeglA
Do you hear this sound inside or with windows down?
I installed new ZCP exhaust and my old catalytic converters ( I had downpipe for some time ) and I hear it very cleary now but only with windows down. My car in non ZCP. Maybe its something with ZCP exhaust?
During slow speed in the city everyone around can hear this sound... Its quite embarrassing... :/
Thanks for the update
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On low mileage M4, I only hear with Windows down.
On my high mileage M3, I hear it both with windows up and down.
Obviously, I hear much less on M3 with windows up, but it's loud enough that I still hear rattling noise with windows up.