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      02-15-2013, 06:04 AM   #19
Max555
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Australia
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Drives: 07 E90 320i
Join Date: Aug 2011
Location: Melbourne

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Mine has always sounded a little bit like a diesel on idle. Been to three dealerships who all said sound was normal. Remove the bottom of your airbox and place a K&N air filter on it and when it revs you won't care about the tapping.
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E90 320i 07 Exec | innovations package | comfort access | 18" ellipsoid 162 | Yokohama 225/40 front 255/35 rear