I did mine in a few hours, it wasn't difficult for me. This isn't a "I did mine faster than yours" or "I did mine cheaper than yours" thread, its just an information thread. Everyone chooses to do it their own way, no biggie either way. Its all irrelevant for me anyway because I had already merged a jdm ej25 legacy ecu into my harness to run my 98 ej25d and I had to remove those ecu plugs to install the ej20k plugs.
Originally Posted by 69subaru360
The 95 EJ18 ECU harness comes out with two plugs behind the dash. It's separate from the complete bulkhead harness. You don't have to pull the whole bulkhead out. You unplug those two plugs, the ecu plugs and the plugs at the back of the engine and pull the whole ecu harness out. Merge about 20 wires, separate the jdm ecu wires into 3 branches, one to the solenoids, one to the back of the engine and one to the 2 plugs on the side of the engine. Run everything out the original firewall hole the ecu wiring passed, it all fits, then in the engine bay over to where it goes. This can all be done in just a few hours.