i had a scare the over day went on to full boost and just started back fireing loads. i dident no wot it was at first but every time i tried to put my foot down it just back fired. then i noticed my boost gage when i put ma foot down it was goin right up to 25-30 psi i was shit maself fort ma turbo was fucked parked up turned out a vacume pipe had come of the actuator. soon as it was put back on its been fine.