The stock wastegate opens at around 4-5psi so I've heard. They reach 14.7psi and drop, go WOT in 3rd or 4th (1st and 2nd you shouldn't see that since its PCM controlled) and you'll see it hit 14.7 and come down since the wastegate opens early. The stock wastegate sucks. But if it was only running 8-9psi and not going higher then that then its got some serious boost leaks or something is wrong with it. I have an 05 and when I bought it... it was bone stock (Stage 0) and my stock wastegate would go to 14.7psi but it would fall from there.