I have a 99 GS-R.... a big reason why i wanted to get the blox manifold (ITR replica) was to get the J's racing intake... it only fits on ITR/replica of the type R's manifold.... wont fit on the GSR one. But i see i would have to get my ecu chipped and i would have to get cams and all that.... so i guess i can wait on that and just keep my K&N drop in for now....