The Walker Exhaust 53576 Quiet-Flow Exhaust Muffler Assembly is engineered to provide a direct-fit, OE-style replacement for the 2004-2020 Toyota Sienna. This assembly is designed to enhance vehicle performance by offering superior flow and a factory-style sound, ensuring a seamless integration with the vehicle's existing exhaust system. Constructed with high-quality aluminized steel, the muffler assembly features a body diameter of 9 inches, a body height of 7 inches, and a body length of 21 inches, with an overall length of 23 inches. The inlet measures 2.125 inches, and the outlet is 2.25 inches, both with an offset configuration. The assembly includes OE-style hangers, brackets, and pipe routings, facilitating an easy, bolt-on installation without the need for specialized fabrication or welding. This design minimizes installation time and reduces labor costs, making it a cost-effective solution for fleet maintenance. The internal drainage system effectively reduces moisture collection, mitigating the risk of corrosion and extending the service life of the muffler. Internal partitions and mechanically joined tubes allow for expansion and contraction during temperature changes, minimizing distortion and enhancing durability. Spun-locked heads and OE-style spot welds provide additional stability, contributing to the overall longevity of the assembly. The OE-style louvered tubes and domed heads work together to lower noise levels and reduce radiated noise, delivering a premium, factory-style sound quality. Acoustic and flow testing validate the design, ensuring consistent performance and sound quality. This muffler assembly is backed by Walker's limited lifetime warranty and exclusive 90-Day Safe and Sound® Guarantee, offering peace of mind and reliability for fleet operations.