Just had this happen about two days ago. First i noticed loss of boost pressure so i changed out both the belt and belt tensioner. Still at about 6000 rpm I'm only seeing 4-5psi of boost when the car is set for at least 9.5psi(my normal boost at that rpm) also i've noticed this loud like popping or flapping noise from under the hood while at full throttle, is this the bypass valve doing this? Normal in-town driving if fine, no sluggishness and no noises from under the hood. I have a DR air-to-air vortech s-trim if this info would help or if others out there with this set-up have seen this before. Full throttle, 3psi boost, loud popping on driverside under the hood....