Very interesting. I was gonna do an OEM attempt but eventually gave in and chose the path of standalone with a tandem STi ECU tied in for passing plug in. Also since I'm building a turbo the standalone made more sense and I've been building up the whole of my OBS. What did you do about coolant passages to the radiator? I got a Mishimoto and am adding a second coolant entery. All my wiring is swapped to 05' STi and 04' STi 6speed and all that jazz. Great job so far. The guy Pat was talking about that had tried the OEM ECU route before was Slack and the dealership had actually tried to help but couldn't. Maybe the UK stuff is the key on how it managed to work? Great job though!