Is the 12psi tune still on the car, or is it back to standard tune? Probably unlikely, but check the hose that comes off the front of the turbo and connects to the boost solenoid. If that's off it will boost well past standard. Click here that thread tells you how to clean the solenoid, use that as a guide to find the hose I am talking about. Follow it from the solenoid and it should be attached to the front of the turbo. Good Luck.