I don't think my car came with a catalytic convertor (1989) so that might not be a problem. I've seen the induction kit for about £60 incl devliery or something like that and thats all i was really looking to spend because my bank balance is showing about -70 at the moment

Would i have to change a load of things if i got just the kit, and does the induction kit replace the air box and filter or does the filter somehow stay?
thanks