[94_AcCoRd_EX]

I found a little more info on it:

Aerodynamic drag is calculated as: F = 1/2 CDAV^2
Where: F - Aerodynamic drag force, C - Coefficient of drag, D - Density of air (nominally about 0.08 pounds per cubic foot.. yes I know that's not a technically accurate mass but it saves converting to and then back from metric), A - Frontal area, V - Velocity of object

So aero drag is basically derived from the coefficient of drag plus the other things mentioned.

This is all I could find about an NSX and drag:
"We had expected the NSX and the 911 to duke it out for the bronze. Their power-to-weight ratios and aerodynamic drag are nearly equal (the 911's greater frontal area is offset by its superior 0.30 drag coefficient). "