I also wouldn't ignore the possible benefits of the Sauber aerodynamics. The larger air pressure relief vents on the sides shows they tested this (at least in the wind tunnel) at high enough speeds to know they needed more relief of the air pressure building up in the engine compartment. That's actually the biggest area of drag and frontal resistance believe it or not. Those aero pieces in the front show them working at redirecting more of the air up and to the side. This thing is probably faster than the HP number would indicate, and more than just being lighter too. No telling what it cost to pay Sauber to do all that development either. Probably part of why they're charging so much. Nothing like having a Formula 1 engineering and development team putting in time on your car.