lube up the regulator with white lithium grease.
Potential problems, in decreasing order of likelyness:
-Regulator not adjusted correctly
-weatherstripping not installed correctly
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2002 TiAg M3 6mt
deoranged, dechromed, led tails, ZHP knob, UUC SS v3, GROM, OEM 220M 19's, Michelin Supersports
2006 YZF-R6, bunch of go-fast stuff