my window did the same thing. what happened was the bolt loosened out form the door and it cut into the metal of the inner skin of the door. so i put a new bolt in it with a washer and scuffed the metal with sand paper and used jbweld to reshape the gouge and lock in the bolt, worked like acharm.

max boost on a stock botm end lsvtec, i wouldnt go past 12-14. but, it mainly depends on what size turbo u go with and also fuel management