AGU definitely then. Do you have a cable throttle? that pulls on the cam on the throttle body? if so, it's an AGU.
Head and pistons are better than AUM / AUQ, but it has a small ko3 turbo instead of ko3S, and the management is much more simple and can't have all the cool new features that the later cars can.
Still a fantastic engine though, mine's an AGU
