Done this conversion to my 500se cabriolet.U need a fiesta turbo engine and ECU map sensor and fuel mixture pot . if u use a OFAC ECU its easy as it plugs straght in. with a OFAB u need to swop round some wires on the ECU plug and the map sensor wiring and plug is different. id use a escort t3 turbo as it fits the escort exhaust but u need to make the oil return pipe. put on a bleed valve on do away with the amnal valve as the xr3i dont have the wireing for it. hope this helps.