[DavidTC]

True BUT how far back were they braking and what speed did they carry into the corner. My point is that the F40 represents a significant step forward in aerodynamic design than the GT40 and the 2 decades in between the designs represents a large difference in aerodynamic development.
I agree the F40 looks unflattering from some angles BUT you need a profile shot for direct comparison with the elegance of the GT40 profile.
The race prepared versions of the F40(the ones with the extended front spliter), have been at Le Mans so there must be comparable terminal velocity data at the end of the Mulsanns straight (even with the kink I suspect an F40 would have been faster), and the speed carried into the corner. There must also be lap times that someone will remember. WE already know what happens at Le Mans if you don't have enough downforce at speed and you then hit a bump !.
David