94-95 GSR OBDI 96+ OBDII. If you stay with the 94-95 you'll be okay. Stay away from OBDII it's not that hard but the wiring is a pain and it'll take alot more time to get all the wires correct not to mention the second O2. Hmmmm..hope that helps. IMO B16a least hassle great platform to start on. crs