I was under my car yesterday and noticed something I never saw before on my car. In front of both front wheels are "NACA" ducts molded into the bottom pan. There's a plug (removable) on the drivers side but, the one on the passenger side was missing. Now, the bottom of the car is fairly flat. Except the central exhaust tunnel. That helps to keep air turbulence to a minimum. Creating a smoother slip stream to promote less drag. I'm wondering if the ducts I mentioned were meant to raise the air pressure in the wheel wells? Or if there was some other purpose for them? Brake cooling?? There was a reason for them. Otherwise they would not exist. Does anyone in here know the true reason for them? The Cd of the car is .29. I'm thinking of adding some more plating underneath to possibly lower that number. As well as lowering the car.