if you take a supercahrger off the gtp and turbo it youll make twice as much power. in ohio i lived right down the road from a guy who had his own shop and was a gtp nut.. he had one with the supercharger makeing 450 whp at 18psi. took it off turboed it and was making like 550 close to 600. and it was going 10s all day long.you can buy cams and everything for them gtp.. you can really do alot to them if you do your homework on the car. i would love to have one as a dd.