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      11-15-2012, 07:47 AM   #4
rtgirard
1-5-3-6-2-4
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Drives: Awaiting 2013 335xi -
Join Date: Sep 2011
Location: Upstate, New York

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If it is in any way repeatable, I suggest taking it in. Here are my wild-ass guesses in order of increasing probability:

1 - Unlikely - Wastgate rattle. Would sound very metallic and possibly louder when the engine is cold.

2 - More likely - Something stuck under the car like you guessed

3 - Most likely - Foreign debris has gotten under or behind the cowl leading to the blower. BMW has a service bulletin on this and there's some kind of foam seal they replace... it's been a while since I heard that... best to ask.
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