Hi I'm actually planning a similar swap. I have a 2003 bugeye wagon that I want to put an 07 STI full swap in. Engine, tranny, brakes, and everything else. I've been trying to find out more info about this drive by wire conversion that people talk about and the electronics portion.
do you know if an 07 STI and 03 impreza are the same in the drive by wire, drive by cable aspect? and how difficult was it to swap out the engine harness and ECU with that from the STI. We were going to go by the wiring diagrams and my brothers been a mechanic for about 10 years with experience on numerous platforms so we should be fine but any extra information I can get would be helpful!
Edit: just realized that you did a JDM swap :facepalm: so that's why the swap was still DBC with you. My bad