I noticed the 'whistle', too... (I have 2-pc VentureShield clear bra meticulously installed.); HOWEVER, I think it's due to the shape/design of the rear view mirrors themselves and NOT the clear bra.
Reasons: The noise (or whistle) only occurs in certain wind direction conditions (i.e.: crosswinds). It does occur on BOTH sides of the car. A passenger with me noticed the noise at the same time I did. In certain wind conditions, there is no whistling... even at speeds up to 85 mph.
Does your 'whistling' occur consistently, all the time (at a given speed)?
Did anyone without clear bra also report this whistling?
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