Product updated on 2021-02-04, RK Sport - RKS:29013000, 2007 to 2013 Silverado 1500 Ram Air Hood, Does not fit the 2500/3500 HD. Add a K&N intake to make it functional. The Hood is fully functional bringing in fresh, cool air directly to the inlet for increased airflow and performance. The Hood is crafted from hi-temp, hand laid fiberglass for exce, 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.