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      11-07-2012, 05:09 PM   #5
JamesM3M5
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Drives: E28 M5, E92 335i
Join Date: Sep 2011
Location: Northern VA

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It's drivetrain related due to the extra torque. Mine does it, too, sounds weird but is perfectly normal.

Anything you do to stiffen the subframe mounts will transmit more noise to the cabin.
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