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      05-09-2012, 08:35 AM   #4
M3SQRD
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Drives: E92 M3,R56 S,F22 228iX,F82 M4
Join Date: Jun 2009
Location: EC

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Yep, it sounds like your diff is making noise. As others have already stated get BMW to change your diff fluid and then the noise should go away.