yosh cams with stock compression make good top numbers but lose out under 6000rpm.This is most noticeable at part throttle.You need another 2000rpm to launch it,proving my point.This loss could be minimised with cam timing but i think a tight squish and good compression with a street ported head would be a great setup and keep any piped 08 busa honest.with 1397 pistons it would be a great streetbike.