to change the injection for EFI you will need Fiesta turbo ECU/engine wiring loom/inlet manifold with fuel rail/regulator, im not sure what else if anything you will need.
Rear disc conversion, you need brackets to mount the caliper and you can use 4x4 sierra rear discs/calipers or maybe 2wd calipers and 4x4 discs or vise versa, you will also need an RS2000 handbrake cable for this. their is a website detailing the full conversion and what to do, i will try and find it for you.
Focus ST170 conversion we usually use the front brakes!
Hope this helps!
