oorsville NC (http://www.a2wt.com/). This is NASCAR country and windowless race shops/top secret speed labs are all over this area.
NASCAR sprint cup team testing and to see what they were doing and the sophistication of the 2200hp wind tunnel was awesome.
experiments with shapes and additions to the body work. Even Small suspension changes can have a large effect on drag, down force and a number of other aspects . Changes to the treatment behind the front wheel even had effect on air box pressure even though the opening for the air box was on top and behind the rider. It's amazing just how complicated aerodynamics can get and how it's all related.