Dynatech Mustang K-Member Headers are the best way to make your Mustang conversion an easy bolt-in. Designed specifically around 79-04 Mustangs with an AFCO Tubular K-Member, using a Small Block Chevy engine. The stepped tube design provides maximum torque and horsepower throughout the RPM range. The 1.750-1.875 long tube design works great with a wide variety of Small Block Chevy engine combinations. A 3.00 collector allows for excellent ground clearance and easy hook up to a full exhaust system. Mild Steel with a High-Temp Black painted finish. Gaskets and bolts included. Optional ceramic coating inside and out.