just out of curiosity, what are the function of the two flaps underneath the car and in front of the front tires??

 

I believe they are supposed to help the car aerodynamically by blocking the turbulent air from going into the tire/tirewell area. Some people also claim that the front-end of the car tends to "float" as high speed without them on.

You should have 2 more in front of the rear tires too.