ok thanks for replying but here is my plan. my z has 176,000 miles and i wanna get to somewhere in between 400-500 hp. I'm bout to buy a rebuild kit so thats why i was asking what their rated at cause i was gonna see if i need to rebuild the stock turbos or just buy aftermarket turbos. what would be the right direction man?? engine rebuild kit w/ rebuilt turbos or aftermarket turbos??