got boost? i dont

i just took my car out for a drive and as i was coming out of a U-turn my car just stopped boosting. i had just hit 12psi going into the turn then blew it off. now my car can only make about 1psi. it gets out of vacuum easily though and my RPM's are going up like usual. it is a stealth TT. i did notice an opening between my exhaust connections though. can anyone tell me if an exhaust leak can stop me from generating boost or what else it can be. all boost and intercooler lines are connected.