Product information updated on 2021-09-17, Manufactured by RK Sport - Part Number RKS:29015000, 2011-14 Silverado 2500/3500 HD Ram Air Hood. , Silverado functional Ram Air hood with louvers. Installs using all the factory hardware and comes Gray Gel Coat., 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.