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High pitch whistle on acceleration

67671 Views 66 Replies 29 Participants Last post by  RKM
I have a '07 G6 GT that I inherited from my 87 y/o grandfather when he past away in January. Yes, it's red because what other color would an 87 year old man drive. Within the last 2 months I've started noticing a high pitch whistle/noise when I accelerate. If I back off the throttle its goes away. I thought it was brakes at first but I get no noise when I brake at any speed. Only when I accelerate. Anyone have any thoughts? Haven't brought it in yet, want to see if its a minor fix I can do myself.


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Theres a defective design in the exhaust resonator. Hit a bump wrong and something inside breaks a bit and you get the whistle on acceleration and certain revs. Pay $1000+ for a new exhaust, or have a muffler guy replace the resonator with a straight pipe for $100. The first can break again, the latter is forever, and has the added benefit of giving the car a bit of a growl.
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