also, it's for the 06 WRX so, there were no 2.0liters, only 2.5liters. ^_^
And, I'm not sure if it would work on the 02, I imagine it might. However, it would also need the test mode connector. Oddly enough, when I had my 02 WRX, I noticed that you could make one but it could get annoying to deal with.