Yeah there isnt much more to expect out of the k20z2 unless you use force induction. My tunner said that with the RBC, CAI, headers and cat back exhaust installed + tune i shouldnt expect more then 110 kw atw, and i cant turbo it or supercharge it as yet because im still on my provisional licence until the end of next year. And it is so hard to drive now, so i have decided the whole engine ASAP.