Most of us have heard it's some bad wiring in the ECU. Try starting the car in the morning when it's cold outside and you haven't used it for the whole night. You should be able to drive around for a few minutes without hearing it at all. All of a sudden, when you press down the gas pedal a few millimeters, it starts making the noise after a few minutes. It's at one specific spot when the accelerator is pressed. After the car warms up in about 4-5 minutes, it does it constantly and your ears feel like they're going to fall off of your head. (That's if your hearing is okay.) Search for "high pitched noise" on the forum and you'll see what others are dealing with. G37 coupes are doing this as well.
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