you can keep the p28 and chip it with the jdm pr3 maps. but youll have to get it tuned and tell the tuner what mods you have on the motor so proper tuning takes place. or till you wana tune it get the pr3. but if the ek got a b16 in the car it should work. but if your already wired for vtec in your eg stay obd1. no reason for rewire if already wired for vtec