Your gtst with 220rw will most likely beat a 'stcok' gtr. My brother has a stock 32 gtr and my gtst with 200rwkw, power fc etc, beats him in a straight line, not by heaps i should add but it does. The thing is though if he put on an exhaust and power fc it would leave my car for dead. probably even with just an exhaust. So basically it would be veruy easy to make the gtr faster than your current gtst with very little mods. I'm in the same boast as you atm and am looking at 33 gtr's as well.