you can have all the horse power in the world and it is shaped like a brick it will not beable to reach top speed like that of a smooth wedge shape one with 1/2 the power. also if you ever watch some cars that drag race that have 500-700 hp that only reach speeds of of like 130 or so, if they had that power in a more aero dynamic car with taller gearing it could go nearly twice as fast. i was mearly over stating that power namely is not as important and gearing and aero dymanics. just look at the c5 corvette and the c5 z06, z06 had more power with only a slightly higher top speed, 5-10 mph.