I just bought my 2000 S4 two weeks ago and assumed it was stock other than the K40 radar built in. Well, I finally checked in the ecu box and the ecu has an ABT sportsline sticker on it. I haven't opened the ecu but is it possible that it's chipped? I don't see why the previous owner would put a sticker on for any other reason. Would cycling between the programs be done using the cruise control for the ABT chip?