Add unique styling while cooling your engine. The front Hood Duck™ helps force air into the radiator stack much more efficiently than relying on the factory louvered grill while the rear Air Ducks™ perform multiple functions; While rock crawling or at an idle, the Air Ducks™ let the hot air that is drawn into the engine compartment by the cooling fan from the radiator stack out of the engine compartment. While driving down the road, cold outside air is forced into the Air Ducks™ from the deflection off the windshield onto the top of the engine.