cheers joz. it depends what car it was taken off. i bought a 4efe jdm ecu that i believe was taken off a glanza s, which came with distributorless ignition, which didnt work. if it has come from a jdm starlet with the same ignition system as the uk spec 4efe it should work, but you will need to find out what size injectors the car it was in used, the glanza s had yellow injectors apposed to the uk spec green ones. the rev limit should be 7200rpm on the jdm ecu. the only other problem you may have is if your car has an immobilizer (which mine didnt) as jap spec cars generally dont have them.