Jackson racing do zetec supercharger conversions and loadsa companies in the UK sell em, thas why you see supercharged focus's in loadsa mags.
Ids made for the 1.8 but fits on a 2litre as its basicly the same engine, jus make sure the fuelings up to it or your fucked.
Supercharged 2litre Zetec Focus in this months Performance Ford mag, same engine as yours, go look...