Product updated on 2019-07-04, RK Sport, RKS:29014000, The HD RKSport Ram Air/Extractor Hood will fit for both the Gas Engine Model as well as the Diesel Engine Model. It is designed to collect and "ram" air into the throttle body, increasing horsepower, throttle response and improving fuel economy while min, 07-10 Silverado 2500/3500 HD Ram Air Hood. RK Sport Ram Air Hoods are ducted to your factory air cleaner location. Add a cold air intake to make them fully functional. On some models you simply need to cut open the top of your factory air box.