The Walker Exhaust 21565 Quiet-Flow SS Exhaust Muffler is engineered to provide superior performance and durability for a range of vehicles, including the 2006-2010 Ford Explorer, 2006-2010 Mercury Mountaineer, and 2007-2010 Ford Explorer Sport Trac. Constructed with 100% stainless steel, this muffler offers enhanced corrosion resistance compared to traditional aluminized options, ensuring a longer service life and reduced maintenance costs. The internal drainage system effectively minimizes moisture accumulation, further extending the muffler's lifespan. Designed for straightforward installation, the 21565 features a direct-fit, bolt-on replacement solution with OE-style hangers, brackets, and pipe routings. This design eliminates the need for specialized fabrication or welding, allowing for efficient and hassle-free replacement. The muffler's internal partitions and mechanically joined tubes accommodate expansion and contraction during temperature fluctuations, reducing distortion and maintaining structural integrity over time. Spun-locked heads and OE-style spot welds provide additional stability, contributing to the overall durability of the product. Acoustic performance is a key consideration in the design of the 21565 muffler. OE-style louvered tubes effectively lower noise levels, while OE-style domed heads help reduce radiated noise, delivering a premium factory-style sound quality. This design ensures that the muffler not only performs efficiently but also enhances the driving experience with a refined exhaust note. The muffler has been acoustic and flow tested to validate its design, ensuring consistent and reliable performance that meets or exceeds factory standards. By choosing the Walker Exhaust 21565 Quiet-Flow SS Exhaust Muffler, fleet operators can expect a high-quality, durable, and efficient solution that minimizes downtime and maintenance costs, thereby enhancing the overall operational efficiency of their vehicle fleet.