That was my thoughts chip, I want 400bhp and not interested in much else efficiency wise...I want the car to be more about acceleration and not really bothered if the turbo becomes less efficient at high RPM as long as its not going to choke.

My main question still is what pressure ratio am I looking at to get 400bhp? I know I need 40lb/min flow but how do I work out what pressure ratio this is @?

Cheers
Dan