Quote:
Originally Posted by XutvJet
Do you have the M Performance exhaust? I've got it and the rest of my car is stock. The MPE can make a pretty loud high pitch whistle under hard acceleration, especially in more humid temps. It's the sound of the wastegate managing boost and the air going supersonic around the wastegate.
I have the stock intake and occasionally can hear a fairly pronounced intake whistle under certain acceleration. No rattles though. I've got the Torque app and can monitor boost. Nothing wonky is going on. It shows expected boost of 9 to 11 psi depending on gear, density altitude, load, rpm, etc.
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I do indeed have the MPE exhaust with the stock intake. I think you are onto something with the air whistling past the wastegate.