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2015 3.6R Limited w/ES
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I should add that the specific sound I've described here has only been confirmed by other 3.6 owners, so it may be totally irrelevant to the Gen II TR580 (which, IIRC, has had some modifications to reduce noise).
 

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2018 3.6 - I have the same noise. totally intermittent. Cold or hot, engine warm or cold.
Dealer duplicated it. Said as designed.......
When I'm noticing the noise---If I put it in manual mode, and hold 2 or 3rd gear above 3500 rpm I can keep the noise as want , depending on throttle input. It even comes down in pitch as the rpm comes down.
Looks like were all living with it. no solution
 

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My 2010 has made this high pitched whistle for almost 2 years now. It's only noticeable between 30-40 mph, and when the outside temp is above 50 degrees (can't hear it in the winter). It only happens when accelerating. The noise goes away immediately when letting off the gas pedal. Nobody has found a solution yet.
 
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