Hey guys I'm looking at purchasing a G3 link with upgraded G4 software for my version 3 Wrx but I can't find any info on the internet about what extra sensors would be required to make it run correctly and how I could check if it's not a dud ecu when I go look at it.. I would put it into my car to test if it powers up when I go look to buy it, but what things should I be looking at on it? Thanks Jordan