The HD RKSport Ram Air/Extractor Hood will fit both the Gas and Diesel Engine Models. It is designed to collect and channel cool, fresh, outside air directly to the location of the factory air box. In combination with a Cold Air Induction kit it can increase horsepower, throttle response and improving fuel economy while minimizing drag. The functional heat extractors help keep your engine bay cooler by drawing hot air out. With our unique baffled design, outside elements such as rain and debris are kept out of the engine compartment. Each hood is crafted from hi-temp, hand-laid fiberglass for exceptional strength and durability. Installation is straightforward using all of the stock hardware.