To see that kind of bhp, you are going to need throttle bodies. You could use motorbike throttle bodies like of a gsxr1000 to keep the cost down, but you will need to use a focus st170 inlet manifold and you will also need an aftermarket ecu. You could then add a performance manifold and decat. This should see around 170bhp. The next step would then be headwork and cams etc.

http://www.fiestaturbo.com/forums/vi...er=asc&start=0

The main restriction with the zetec engine is the standard inlet, so to get any decent power you have to dump that.

Im going down the lines of a focus 2ltr inlet manifold (which flows better) and the 65mm larger central throttle body, then raceline cams and headwork. Not sure what power that will be producing but hopefully i wont lose as much torque as when you add throttle bodies.