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I have the same issue with my 330i. It only happens during a cold start though and goes away after about 10mins of driving. When the RPM drops down to 600rpm at a stop, it's a loud vibration that sounds like it's coming from behind the steering wheel. I went to the dealer last week and they checked all the panels in that area, the exhaust, and motor mounts and everything was ok. They said they compared it to another 330i and "it was a normal idle sound." I guess i'll deal with it now that I at least know everything checked out ok.
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