Originally Posted by Stage6

looked at this a while back myself, but opted for the common as muck puma conversion.

will be building a 200-300bhp zetec turbo some day to go in a mk5 zs.... i found some useful info on fiesta-turbo + fiesta-si forum
says you can use the focus 2.0 ecu in place of the 1.6 one just like the mk3 si boys can swap for a 2.0 mondeo ecu.
not sure about wiring, would assume the 2.0 engine loom
use a focus 1.8 box aswell, puma/zs driveshafts fit the 1.8 box

obviously would also need a custom upper engine mount, some people use focus ones but they dont look too good to me, personally id get some cardboard and make a template then get some metal and weld it all up in the form of a new mount lol..

someone on the zsoc forum has built a st170 powered mk5 zs
and on facebook someone called Todd, has built a nice zetec turbo'd one.

quite a few people are doing this conversion now, kinda wish id stuck with it and not done the puma swap tbh. it'd probably be in and running by now!