The Walker Exhaust 54681 40" x 11" x 5.5" Stainless Steel Exhaust Muffler Assembly is engineered to provide superior durability and performance for commercial vehicles. Constructed with 100% stainless steel, this muffler offers enhanced corrosion resistance, extending the service life compared to traditional aluminized mufflers. Its direct-fit design ensures a seamless installation process, reducing downtime and labor costs. The internal partitions and mechanically joined tubes accommodate thermal expansion, minimizing distortion and maintaining structural integrity under varying temperatures. The OE-style louvered tubes and domed heads deliver a factory-like sound quality, contributing to a quieter and more comfortable driving experience. This muffler is compatible with 1999-2002 Toyota 4Runner models, both RWD and 4WD, providing a reliable replacement option for fleet maintenance.