The Walker Exhaust 21289 Quiet-Flow SS Exhaust Muffler is engineered to provide superior performance and durability for heavy-duty applications. Constructed entirely from corrosion-resistant stainless steel, this muffler offers a longer service life compared to traditional aluminized models. Its internal drainage system effectively reduces moisture accumulation, mitigating the risk of rust and extending the component's lifespan. Designed for easy installation, the muffler features a direct-fit bolt-on replacement solution with OE-style hangers, brackets, and pipe routings, eliminating the need for specialized fabrication or welding. The internal design includes 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 the muffler's stability and longevity. Acoustic performance is optimized through OE-style louvered tubes that lower noise levels, while domed heads help reduce radiated noise, delivering a premium factory-style sound quality. The muffler has been acoustic and flow tested to ensure reliable OE-style sound. Backed by Walker's limited lifetime warranty and exclusive 90-Day Safe and Sound® Guarantee, the 21289 Quiet-Flow SS Exhaust Muffler is a reliable choice for fleet operations seeking durable and efficient exhaust solutions.