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ctwickman · 11-18-2012, 08:39 AM

You sure it's not the high pitched sound of the turbo winding up or down? Does it only happen during or immediately after an increase in acceleration?

11-18-2012, 08:39 AM	#9
ctwickman New Member Drives: 2011 M3 E90 Join Date: May 2012 Location: Chicago Posts: 17 iTrader: (0)	You sure it's not the high pitched sound of the turbo winding up or down? Does it only happen during or immediately after an increase in acceleration?