APR Performance Carbon Fibre Front Airdam F&D : USA Cotton Fun & Daily. Underbody components such as front air dams, undertrays, and rear diffusers are essential for maximizing aerodynamic performance. The APR Performance Front Air Dam integrates with the factory front bumper to: Reduce lift. Increase front end stability. Improve high speed cornering grip This Front Air Dam also utilizes a built in aerodynamic splitter design that creates a high pressure region of air atop the protruding surface, further reducing lift and increasing net downforce.