Okay my car is doing something wrong, When I accelerate everything sounds great, I have the EVO system and all is well. But when i let off of the gas after producing any amount of boost, there is like a "flapping" sound or some sort of "air" leaking sound. It almost sounds like there is a rubber flap inside the tube and it is flapping when i left off the gas. Does anybody know what this may be? It is driving me crazy!

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