The Walker Exhaust 21355 is a high-quality exhaust muffler designed to provide superior performance and durability for commercial vehicles. Constructed with 100% corrosion-resistant stainless steel, this muffler offers a longer service life compared to traditional aluminized mufflers. Its internal drainage system effectively reduces moisture accumulation, preventing rust and extending the component's lifespan. The muffler features internal partitions and mechanically joined tubes that allow for expansion and contraction during temperature fluctuations, minimizing distortion and enhancing structural integrity. Spun-locked heads and OE-style spot welds further contribute to its stability and longevity. For optimal acoustic performance, the 21355 utilizes OE-style louvered tubes to lower noise levels and OE-style domed heads to reduce radiated noise, delivering a premium factory-style sound quality. Designed for easy installation, it serves as a direct-fit bolt-on replacement with OE-style hangers, brackets, and pipe routings, eliminating the need for specialized fabrication or welding. This ensures a seamless integration into existing exhaust systems, reducing downtime and labor costs. The muffler's dimensions are 28 inches in overall length, 7 inches in height, and 9 inches in width, with an inlet and outlet diameter of 2.5 inches each. It is compatible with specific Ford and Lincoln models from 1999 to 2002, including the Ford Expedition and Lincoln Navigator. By choosing the Walker Exhaust 21355, fleet operators can enhance vehicle performance, reduce maintenance costs, and ensure compliance with noise regulations, all while benefiting from a durable and efficient exhaust solution.