Escort Rs has a different head to suit the Mfi.. whereas the fiesta is run on Efi
to fit an S2 loom to a fiesta engine you have to modify it which is more hassle than its worth.. its easier to get an adaptor plate which allows you to fit EFi onto a escort head so then you can use a fiesta loom
and no theres no difference in power between the 2 engine
Escort used Motorola engine managment, fiesta used EEC-IV-management
escort engine used a t03 turbo whereas a fiesta engine used a t02 turbo
and fiesta engine used a slightly smaller clutch as standard
Afaik.. so don't take my word on it
