i have a gt30 on mine with 500 bhp and a mate of mine had a 440ish mad set up on vipec with a t38 hes just fitted a hart inlet and a rb t38 ( he says the spool up is much better now ) and mark told him hes getting close to 500 now but i guess the turbo is right on its limit and he only runs 2 bar of boost i think wear mine runs 2.6 and i dont know what sort of torque he has havent put the too against each other yet but dans is a very fast car!