Hello, at first sorry for my English . I am going to swap d16y8(obd2a) to b18c4(obd2b) from UKDM Civic. My car is HCC 6gen EJ8, car harnesses are obd2a, d16y8 ecu had immobilizer. As I know, I have to convert ECU plugs to fit obd2b ECU. I will do that using ECU pinouts form Turbo D16 :: View topic - FAQ: Civic ECU Diagrams (88-00) But how about engine harness? My car's engine harnesses are 1-piece design, and b18c4 are 2-piece design. If I disconnect all plugs from d16y8(obd2a) engine , and connect directly to b18c4(obd2b) engine, will they fit? Thank You.