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      08-30-2011, 06:09 AM   #5
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Drives: 2011 M3 COUPE
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Originally Posted by MischiMischi View Post
I think it is definitely a drone - you can also feel a slight vibration.
Even OEM has slight drone at that RPM. BMW put out a tech bulletin about that years ago. In my opinion the performance drone is no more or less than the OEM muffler.