called a shop.. here is the answer i was lookin' for: boost goes from turbo to intake manifold and with no bov it goes back down from the intake manifold in to the turbo.. cause there is no bov.. stick on an intercooler then you have hot air going out the turbo through the intercooler and then you have cold air going into the intake manifold.. when you left off the gas now instead of hot air going back into the hot turbo.. you have cold air going into the hot turbo.. which will shock it, which is bad!!

taylor