What is a sure way that you can tell if you stock BOV is leaking. I have the Stage 1 and I knopw the boost tapers so how can I tell?

 

The boost is supposed to taper. Mine hits 22psi and drops to 18psi; that's the way Shiv tuned it. There is an excellent way to test your BOV in a thread that is stickied at the top of the Engine, Turbo, Drivetrain forum started by Silver Surfer. Check that out.