Aerodynamics of a bug

[judgie]

have spent most of today under a lotus elise and it has a compleatly flat under try with a small venturi[?]at the rear,also 2 small naca ducts under engine/gearbox.ducting also from the grill in the front exits from the bonnet vents after flowing through the rad.worked an a exige[motorsport elise]a few weeks ago and that had vents in the back of front wings and sort of vanes directing air towards the sides and the rear venturi.also a big wing up in clean air.
i know a lotus is no bug but,you have to take ideas from any whare.
cheers rob