Product information updated on 2021-06-26 Manufactured by RK Sport - Part Number RKS:29014000, 07-10 Silverado 2500/3500 HD Ram Air Hood. , 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, 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 install a cold air intake or open up the top of your factory air box.