They do have a stock boost gauge, on your right above the vents on the dash, pretty descent location, visible. Stock psi is not 6-9, maybe if you had a boost leak somewhere . Stock psi should be around (on a car with minimal boost leak), maybe spike 16 (on a good day 17 ), hold anywhere from 14-15, and as you reach redline it will drop to about 11-12. As stated before by other owners, an aftermarket WGA will help a lot with this. & listen to what WhiteFwdsm has to say, he knows his shit pretty well . So ya, check out srtforums.com, there's a lot of info on that forum, just go through the threads.