A 2.0 blacktop will do 150-160bhp quite comfortably with ST170 4-2-1, decat, cat-back, Stage 2 cams, verniers, under drive pulleys and a good map. May even get close to 170bhp if you are lucky and 150ft.lbs of torque. My old 1.8 Zetec Focus had all the above plus an AEM style long arm induction kit and was custom mapped at MSD and was 145bhp prior to the map and it drove much better all through the rev range so arse dyno says 145bhp plus a bit more on a 1.8. Focus went well too so would think a MK2 Fez would go really well!