Originally Posted by Andrewxxcarlson
Airboy, Eric emailed me back saying,
Actually VAG Com doesn't work on 02-03 at all and 04-05 have to be modified to work. it works just fine on the 06 wrx.
From what I've read, they need to be modified to work on the 02-03s, and even then they may not work, and that the 04-05s don't need anything done, they're just plug and play.