st170 only has 143lb/ft a std 2.0 has 131lb/ft and if you fit the st170 exhaust system it gains 15lb/ft (proven 14lb/ft gain on my 1.8 and 17lb/ft on my old 2.0)

the st170 in its factory form is a poor engine with extra faults that anit on the normal zetec-e and on the suspension its not better its just 10mm (ish) lower all zetecs have the sports suspension just the st springs are lower thats it, brakes wise yes the front are uprated all round but the rears just have bigger disc's using the same parts and gearbox wise you'd be lucky if the flywheel doesnt take it out which when the clutch goes you need a new flywheel to and it anit cheap iirc its £400 just for the flywheel plus the clutch and labour.

? from what ive seen st170s are useless untill you get them up to 4,5k and not one of them even make 170bhp std there mostly 150 to 160bhp.