honestly man the only difference between the "JDM" engine and the USA engine is the intake manifold and valve cover. The JDM engine will say CYCLONE on the intake manifold and its pretty useless unless they installed the japanese wiring harness and ecu which controlls the butterflys in the manifold. JDM engines usually have 39k miles or less on them. the valve cover should say mitsubishi on it and it should be red. sometimes they will have 510-550cc injectors and a 16g.