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      05-03-2016, 10:03 AM   #5
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Drives: (Sold) 2011 E92 335i ZMP 6MT
Join Date: Mar 2014
Location: USA

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Mine does it on startup as well. It takes about 15-30 seconds or so before the rattle noise goes away and the exhaust note changes. I don't know if it's normal. I don't experience any specific issues, but if it's an indicator of one, I'd like to get it figured out. I'm tempted to take it to the dealer while the car is still under warranty.
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