unfortunately the PE on my car only put 320 to the wheels, which i found unacceptable, i think that most of the direct bolt on turbos are gonna limit you to around 320-350 IMO. I tuned the car w/ the UTEC on the dyno for countless hours and thats what I came up with. And the 320 was at what I thought was the max the motor could handle boost wise. You can certainly flow lots more air at lower boost levels w/ a ratty old T3/T4, but I wouldnt know anything about that.....lol