It's not the ST kit, it's just the same bumpers etc. as the petrol Zetec-S. St is the next model up. I think the St has slighty different bumpers, discs on the back (zetec-s has drums) and 17" wheels as standard and the ride is stiffer, my brothers is a pretty harsh ride so i have no idea what an st would be like. Zetec-S has 16" wheels which imo look better than the 17's anyway.