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Old 11-12-2012, 03:36 PM   #8
Slowered318
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Join Date: Jan 2002
Location: Toronto
Posts: 6,001
Might be the flap vent from the trunk to inside the rear bumper, thats where the sunroof drain should be if it's connected properly. It could also be your trunk seal, mine leaks a bit into the battery area when I wash the car or park nose down in the driveway.
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The major difference between my 318is and an e30 M3 is that the noises come from the engine and not the passengers
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