Get more air into your diesel engine by replacing the factory air filter and air intake housing with a K&N High-Flow Intake System, now available for the 2011-'12 Ford F-250/F-350 Super Duty 6.7L diesel. Greater airflow means extra horses -- up to an estimated 12 hp at 2700 rpm -- and better fuel economy. The system comes with a K&N Roto-Molded Polyethylene Tube, powder-coated heat shield, and a washable and reusable air filter.