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Does anyone notice a very slight whistling noise upon acceleration? Noise goes away upon release of gas pedal. What is causing this? Dealer could replicate noise but couldn't pinpoint issue.
 

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The whistling was coming from the stone guard on the left mirror. They said it happens with the M5 mirror and some Lexus mirrors. He trimed some of the film off the top of the mirror and the noise went away.
 
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