Direct bolt on and play. Everything is the same as far as sensors go. Find your self a b20z. It has the highest compression which is 9.6. If you get the b20z, your going to need a gsr throttle cable if your planning to keep the intake manifold because the throttle body is set up like a gsr and the manifold dose not have a mounting bracket hole to accept non gsr cable. B20z will make 128-130 on the dyno and with the torque, It'll pull a mild bolts on gsr. My old 94 gsr with b20z and ls tranny complete stock except short ram intake will pull gsr tegs and even hold up fairly good with a stock on itr teg.