Ive got a rs1800 engine in my mk3 escort, i used a 1.8 105bhp flywheel, rst clutch and xr3 g/box. I used the mk5 xr3i escort manifold and down pipe, with egr blanked off, and flange welded on to piper xr3 system to suit mk5 down pipe. Ul have to use the zetec wiring loom and ecu, if ur using the efi. And take a wire from the EDIS pin 1 or 11 and feed it to ur rev counter........