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      10-30-2012, 09:40 PM   #9
galahad05
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Drives: '07 335i e90
Join Date: Mar 2008
Location: Long Island NY

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Okay, yeah I heard that.

Still don't know what it is though. Sounds vaguely like a turbo bypass valve running.

Ideally you'd do the ol' "mechanic's stethoscope" routine on it, to isolate where it's coming from. I take it you can't reproduce the sound revving the engine while parked?
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