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      12-06-2012, 11:15 AM   #3
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Drives: e90 335i JB4
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2007 BMW 335i  [0.00]
Originally Posted by Nigelo View Post
Could also be the exhaust flapper - on a cold start the extra exhaust gas can sometimes set it wagging.
Makes sense, it is quite a loud noise. Mine has been unplugged from the vacuum so the more i think about it, the more likely you are correct.

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