You need to put a load on the engine to make the noise happen. Ive tried having the car revved with the heat shield off to watch the wastegate actuator for movement but no deal. I have also read somewhere that the noise was exhasut leaking from around the wastegate shaft in the turbo houseing. the guy changed the houseing and the noise stopped. Take your heatshield off and look to see if their is any soot under it at all.

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The one perkent...