Well I just installed the ATP UPP and HKS BOV, and let me tell you it was a chore. Anyways, the stuff is nicely made, so I'm happy. Now, never having a turbo before, I dont know is this is right? Is the BOV supposed to vent even after part throttle let offs? I mean im just cruising and let off the gas, and it hisses. Should I tighten it, or is this normal?