ok here is how to check it for sure. take your car out driving and floor it and see how many bars you get at WOT. if u dont have all bars open your hood and locate your boost bypass valve on the supercharger. Here is a pic
there will be two vacuum lines goin to it. one goes to from the bbv to the cap on top of the s/c like u see in the pic and the other is facing towards the front of your car. Unhook the rubber vacuum line that is facing towards the front of your car from the boost bypass valve. And then drive your car and go WOT and see if you have all your boost bars than. if you have all of them than you need a new bbv. Good Luck
Bryant
