youa re better off changing the intake / exh. manifods off your S13 KA onto the S14 KA and using all the S13 wirign and ECU. the wiring is TOTALLY different from S13 to S14. expect to pay someone $350 to do the wiring for you. you wont be able to amke it work yourself without help form someone knowledgeable. do it right use the S13 parts...