Quote Originally Posted by gse_turbo View Post
I could be mistaken but I believe the Optra ECU is a direct plug in to the early model Aveos. Aside from the swap the only thing needed should be to modify the 1.6 engine harness to the 2.0 layout.
for the first generation you are correct. But since you will be plugging in the ECU, and such, most of the better junk yards include the engine harness if they are including the ECU in the deal. So you would not need to modify the harness, you just swap it ALL in.