Are the wiring harnesses for the WRXs all the same between years, if not are they compatible? will a 05 harness work with a 04 motor and ecu, or a 03 motor and ecu? or is the harness/ecu/motors too different and it is not feasible.
Certain parts are different per year. The rear harness on late '03's and up have an extra plug compared to the earlier models for instance.
