04-08 FORD F-150 F150 XL/XLT/STX 4.6L V8 PICKUP RACING MANIFOLD HEADER EXHAUST
Performance header provide each cylinder with its own mini exhaust pipe, which means exhaust headers prevent interference among cylinders; thus, the backpressure that occurs in common exhaust manifolds. When cylinders don't have to fight with each other to expel their exhaust, they can put more power through the wheels, pushing the engine to the full potential.
Made of High Quality T-304 Stainless Steel with Computerized Mandrel-Bends for Strength and Durability
i.e. Maximizing Smoothest High Exhaust Air Flow Rate