I have been working on cleaning up the air flow under my 2011 Mustang track day car. One thing I have been thinking about is adding vertical rubber side skirts between the front and rear wheel openings. I'm trying to keep the air flow under the car clean with minimum turbulence to get the greatest effect from the rear diffuser. The side skirts hopefully would limit the amount of turbulent air from getting under the car from the sides. Rubber is cheap, wouldn't effect the car if it touched the ground and can easily be taken on and off for track days. Has anybody gone down this path? I'm curious if its worth the effort.