dude they look physically the same other then fact that YOU say pre-obd has no knock sensor? along with some wiring differnces in which you can cut splice the 92 civic harness and use that they are almost the same! also i figured the question was about switching just the bottom end! One prob. with the net is there are a bunch of RICERS who try to act like they know everything and that they are smart and take advantage of any chance they get try to prove people wrong to make it seem like they actually know SOMTHING! thanks eric