hi,the st170 calibration require all the units the vehicle was originally built with be connected.if this is not done the ecu slowly derates the system and you will continually loose performance.you will also need to use the same gearbox as a change of gearbox requires certain flags to be set in the ecu.again if this is not followed you will encounter a reduction in performance.depending on what you are building you may find the 2.0lr-tr focus package may be the more economical package to build with performance of up to 180bhp can be gotten with little change of mechanical parts and the right ecu.
please give me an idea of what you are building and i will tell you which way to go.

gatekeeper