Quote:
Originally Posted by BornATeste
I hear this too, I've always wondered if this is the wastegate. My understanding of it is that it utilizes a PWM solenoid in order to control boost. It does this by opening a valve in the exhaust housing that is connected to the solenoid via mechanical linkage. If there is any slop in the linkage then it makes sense a metal on metal noise would occur.
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I suppose this is possible, would make sense given that it only happens under heavy load.
To update all, the dealership has had the car a few days, and the tech can hear the noise, but they said they are having a near impossible time trying to pinpoint it.