the 89 crx si harness plugs onto the motor no problem right? and then the boomslang will plug onto the ecu harness right.... i will have to wire up the vtec and o2 sensor and thats it right? so what do you mean replug everything??? and yes i know it is better and i am gonna go back to obd-0 when i find someone who will trade but i need the car running for right now to make sure everything is good then i just will sell the boomslang to a friend of mine who needs it and i will trade the ecu and dizzy when i find someone... but i want to get it runnning now... so what do you mean replug everything?