if you put a 1.6 in i think it will all plug up with the standard 1.25 loom but you will need the 1.6 ecu.

would be better if you put the z-s loom in just to be on the safe side

remember to get the chips out of the 1.6 keys so the ecu will let you start the car

1. remove 1.25
2. replace the 1.25 loom with 1.6
3. drop the 1.6 in
4. plug it all in
5. off you go

hope that helps