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Engine noise

Engine

Vehicle Information: Year: 2002; Body Type: Coupe; Total Mileage: 5500;

I have put a Fadspeed exhaust and K&N filter in my 2002TT and a buzzing noise started to occure. I don't know if this is related to the modification. The buzzing noise sounded like a electric pump noise. I had the dealer looked it over and heard the noise too. The dealer thought it was the engine pressure valves failed to close when the car is slowing down when I let out the gas but the noise is still there after they replaced the valves. This is how the buzzing noise occured. Almost every time when I let out the gas to slow down the car in 3rd or 2nd gear from around 3500 RPM, the noise started to occure. I can only hear the buzzing noise after the exhaust noise is down since Fabspeed is pretty loud. Sometime I can step on the clutch to shift to neutal to make the buzzing noise disappear (this does not work everytime) or sometime I can lightly rev. the RPM to make the noise go away.Any one out there please help me with this problem. The machenic and I just can think of any possible solution and maybe you guys can give me a hand with this.

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