before i did my c5 swap, i boosted the hell out of the D that was in my car to see how well it would hold up before it blows. i opened up the wastegate all the way and maxed out my 3 bar which equates to 26-27 psi? i dont remember the conversion off the top of my head. but i was riding around on that for a min until my big toe got happy. i was spinning 5th on a street tune..