A friend just gave me his old superchip which he doesn't need anymore because he's sold his car. And since it's free I'm going to give it a try.
1) Where is the ECU on the Astra Mk3 GSI? How do I get to it?
2) What's the procedure for changing the chip? Do I need to disconnect the battery first?
3) Is there anything I should/should not do?
4) I heard that not all the Mk3 GSIs come with the exact same ECU. Is it true that there are 3 versions of ECU that the car could have come with. Will this chip work on all 3 versions?