I spent the past weekend studying this problem and I think JD has it right. I just called my installer to come back out and try this again as the whistling noise is driving me bananas. I have 3M and the installer is the same guy who installed OP's clear bra.
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MJ
BMWCCA Member 414020
128i Sparkling Graphite - 6SMT - Black 'ette - Burl Walnut trim - Sport Package - BMW Assist - iDrive/Nav - Comfort Access - iPod - Heated Seats.
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