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[quote][i]Originally posted by GIBBS[/i] GSi_16v, the chatter you mean is from a wastegate, you have 2 valve's on a turbo system, one is the dump valve(bov) this releases the Forced Induction Air to stop it possibly damaging the turbo when you come off throttle, and the other side is the wastegate you will not normally hear anything on a standard car but when people upgrade turbo's they will have a larger external wastegate to avoid overboost, a wastegate is on the exhaust side of the turbo system, it releases the hot air to stop it from spooling up the turbo, normally if your car is set to 9psi and ure on full boost the wastegate will open enough to stop it boosting over 9psi, an uprated external wastegate will generally release all exhaust pressure when you come off throttle causing the chatter. [/quote]
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