The two main byproducts of an internal combustion engine are heat and exhaust gasses. The heat is drawn away by the engine’s cooling system, and the exhaust gasses are drawn away by the exhaust system. An exhaust system is far more than just a series of pipes. There are complicated reactions and processes that occur in each section of the exhaust, and the efficiency of these processes determines how well an exhaust works for you. The more easily the exhaust flows, the less power your engine has to use to push the gasses through, and if you have a Ford, you should install a set of Ford Racing headers to maximize your airflow. Ford Racing headers, like all headers, are essentially highly tuned exhaust manifolds. They bolt directly to the block (with a gasket) and they take the exhaust gasses down into the rest of the system. Ford Racing headers are polished internally and designed so that no exhaust pulse interferes with any other exhaust pulse, which would create turbulence and reduce your power. Because of their design, Ford Racing headers look simply amazing, and with them installed, you exhaust will have a wonderfully even sound. All customers certainly deserve outstanding assistance while shopping for quality auto parts for their car or truck. Because you deserve that, we've created a twenty-four hour a day customer service desk to aid you with your requests. Nobody likes to pay for shipping, so your parts come with totally free shipping on every order over $50. If you find a better price, call us - we always beat any advertised price for auto parts.