bumpers of the faster higher speck cars have a tendancy to be LESS aerodynmic
sacrifices are made to make it Look fast and mean and stuff. as it's a hot hatch not a racecar. on the bog std base cars there more fussed with economy so if an easy gain is had from aero they take it. on the more powerfull models economy isn't quite so high up the list so things that look cool but bugger up the aeros aer allowed