Hi everyone i have a ek4 car and ive recently bought a b18cr engine. But im missing a harness from the engine to the ecu just wondering if my b16a2 harness can fit in b18cr or do i have to rewire the whole thing.

Tnks

 

You should be able to use your B16A2 harness w/ no issues. You will need an OBD2B P73 ECU for it to be completely "plug n play" w/o any modification.

 

Or a OBDII to OBD1 jumper harness and a Chipped P72 or P28 OBD1 ECU