The AP Exhaust 700346 Exhaust Muffler is a direct-fit MSL Maximum muffler designed to replace the original equipment muffler in specific Ford Expedition and Lincoln Navigator models from 1999 to 2002. Constructed from 100% aluminized steel, this muffler offers enhanced durability and resistance to corrosion, ensuring a longer service life. Its oval body measures 7" in height, 9" in width, and 20" in length, with an overall length of 24.5". The inlet and outlet both have an inside diameter of 2.5" and are configured in a left lower inlet and right upper outlet arrangement, facilitating straightforward installation. Engineered to perform like the original equipment, this muffler provides maximum sound control and back-pressure performance, contributing to a quieter and more efficient vehicle operation. The thick, expandable aluminized necks allow for easy sizing, accommodating various exhaust system configurations. This muffler is compatible with both rear-wheel and four-wheel drive versions of the 1999-2002 Ford Expedition and Lincoln Navigator, making it a versatile replacement option for these vehicles.