if it is an 8 valve it is an easy swap. it is not a huge gain over a good running 1.3, but if you have a tired 1.3 you will notice a huge increase. now if you are talking a 16vavle 1.6 then it is a bit more involved, and more powerfull yet. do gears before you do the 1.6 swap. gears will give you a bigger improvment. you will need a swap kit from any one of the normal zuki vendors. cost a couple of hundered dollars.