hmm i cant tell you whether or not it will bolt right up, but larger bore and aftermarket throttle bodies are BS 99% of the time unless your car has a good sized lift cam in it and is just starving for air. aftermarket TBs run around $2-300 and im sure a gs-r throttle body is a hell of a lot cheaper but for the dough you could hop on a dyno and see what your a/f situation is like. youll pull 50x more power out of a good tune then you would an aftermarket TB. just my $.02...