These are True Dual head pipes, eliminating the catalytic converter and providing unbeatable performance. They eliminate the stock cross over head pipe on Twin Cam models and consequently reduce heat with approximately 30%. Headers for Milwaukee Eight powered models are available with or without cross over head pipe. These headers work with both stock and aftermarket mufflers, no matter if it is a stock or Big Inch Monster Motor. Features 1 3/4" (45mm) headers and 220 degree, 16 gauge heavy duty full coverage 2 1/2" (64mm) outer diameter heat shields. These headers come with all mounting hardware and have O2 ports in the stock positions. Available in chrome or black ceramic coated.