The Walker Exhaust 21742 Quiet-Flow SS Exhaust Muffler is engineered to provide superior performance and durability for commercial vehicle fleets. Constructed entirely from corrosion-resistant stainless steel, this muffler offers a lifespan up to three times longer than traditional aluminized mufflers, reducing the frequency and cost of replacements. Its internal drainage system effectively minimizes moisture accumulation, preventing internal corrosion and extending service life. 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. This design ensures a seamless integration into existing exhaust systems, minimizing downtime and labor costs. The muffler's internal partitions and mechanically joined tubes allow for expansion and contraction during temperature fluctuations, reducing distortion and enhancing structural integrity. Spun-locked heads and OE-style spot welds provide additional stability, contributing to a longer service life. For optimal acoustic performance, the muffler 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. Acoustic and flow testing validate its design, ensuring consistent and reliable performance. Backed by Walker's limited lifetime warranty and exclusive 90-Day Safe and Sound Guarantee, the 21742 Quiet-Flow SS Exhaust Muffler offers fleet operators a reliable and cost-effective solution to maintain optimal vehicle performance and compliance with noise regulations.