this
i have hks 272 10.25* in/ex cams 1mm oversize valves, retainers, porting , the lot
i have the same turbo and have a full 4" exhaust, its lumpy as, not quiet at all, draws alot of looks from people close by/ across the street.
i wouldnt want to go any bigger for the street
with this set up my redline is 9250, n wants to keep going.
full boost at 6000rpm
for your power level just run e85, 28-30 psi and you will make well over 500kw, i wouldnt worry to much bout the cam choice