Hedman Headers offer excellent exhaust flow, reduced back pressure and improved performance. Includes hardware, 3" collector to 2-1/2" exhaust reducer, gaskets and instructions needed for installation. Headers are painted black. Tests have shown a 1.1 second improvement in 0 to 60 second times. Expect up to a 20% increase in horsepower and up to a 10% increase in gas mileage. Call or go online and order yours today! Increases in fuel efficiency and horsepower are based on a truck operating at factory specifications. Increases may vary according to the condition of your truck and driving habits.Will not fit models with smog injection or injection heads. Will not fit late model vehicles with hi-torque starter.