We fitted an ST170 engine to my brothers missus Escort GTi (Mk6). It was NOT in any way a straight forward job. Everytime we overcame one hold up we fell straight into another, this may have been compounded as we wanted to retain the airconditioning. Engine mated up to an IB5 box and I think we used a standard RS Turbo clutch. At present the car is running on a stock 2 litre Mondeo ECU which oddly on the rollers at Evolve produced a very nice power and torque curve with nice fueling. Saddly only made 150bhp but with no cam timinng adjustment we were quite pleased. Have some throttle bodies and DTA management to go on at some point in the near future.