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. 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!New mid-length headers provide maximum ground clearance for lowered trucks and allow exhaust pipes to be tucked so they don't extend below the frame rails.When installing #36-6010 it is necessary to cut existing lead pipe to attach new header adaptor pipe that is included with Header Set. When installing #36-6020 it is necessary to fabricate your own lead pipe to complete installation. Headers are painted black.Not legal in California for use on emission controlled vehicles. 1966 and newer U.S. manufactured California Certified vehicles are considered emission controlled vehicles.MT = Manual Transmission