Although the 200 and 250 engines are reliable and economical, they offer little when it comes to raw performance. Scott Drake has changed the way you look at 6 cylinders with this Single-Outlet Header Kit that is perfect for your 1964-1973 6-Cylinder Mustang. This single outlet header sports beautiful nickel-plated tubing and will provide you with unmatchable durability for miles to come. The installation of this Scott Drake Single-Outlet Header Kit will improve both the horsepower production and the fuel economy of your beloved Mustang. The primaries on this single outlet header have an outside diameter of 1-1/2" and the collectors measure 2-1/2" in outside diameter. The exhaust port divider, part #C3OZ-9430-EPD, which is sold separately, smooths out air flow between the #3 and #4 cylinder can be purchased separately. This divider is good for a 5 to 10% horsepower increase alone. This header includes all necessary gaskets and mounting hardware.