Saw this on my internet travels..
I don't have the money for that, but a punched body pan???? basically allowing the exhaust and engine air to escape the length of the underbody without disrupting under body flow? The punches are up towards the body and facing the front of the car, not punched down creating more drag. They would be like scoops catching flowing air between the pan and body... Then directing it under the body.
~C