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      11-22-2012, 01:32 AM   #25
MAC335i
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Drives: 2007 Jet Black E90 335i
Join Date: Nov 2009
Location: California

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I think Jeff may have it. But I have never experienced this till today actually. So I can't say I agree that the sound is normal. It does go away if I blip the throttle and reoccurs when the RPMs get back down to ~600.