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      12-23-2011, 08:59 AM   #4
DavS1
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Drives: Emfree
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2011 BMW M3  [0.00]
On further inspection, it appears to be speed clips similar to these:



which hold the wing to the A pillar, which can be seen from the outside with the door half open. My guess is the bolts simply come loose with wind vibration, so lock tight is used to stop them rattling about, I'd put my money on it being that as it's in exactly the area I could hear the noise from!
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Monte Carlo Blue M3 Comp