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It's not the E-Brake making this noise, or the side bolsters, or the cooling system afterrun for the turbo's, or the door locks, or the parking pall for the transmission................etc. (These all make seperate distinctive sounds.)
Before shutting down your engine, roll your window down. The sound takes place roughly 3 seconds after shutdown and is a quick squeal. Reminds of sound that something would make that needs lubricating. It is definately coming from outside the car...either underneath the car..maybe the valves in the exhaust, or from the engine bay somewhere. Im going to look at the exhast valves tonight, otherwise think it could be the actuators on the turbos.
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