Does NOT fit the Navigator L with the 131.6" Wheelbase. This 2.5" diameter Cat-Back™ system features single 4" round black chrome on T-304 stainless steel tips on each tail pipe. It delivers the mellow Touring sound with no drone inside the vehicle. The rear resonator assembly contains an internal H-Pipe for increased performance and improved sound. BORLA® Cat-Back™ & Axle-Back exhaust systems feature patented straight-through and multi-core technology designed to unleash hidden horsepower. Increased exhaust velocity adds power, driving excitement, fuel economy, and the distinctive BORLA® Sound of Power respected by motoring enthusiasts everywhere. Each system is built from premium T-304 stainless steel, superior to T-400 series knockoffs (such as 409), to give you the absolute best in performance and durability. Ultra-smooth mandrel bends ensure maximum flow & power, and precision computer numerical control (CNC) manufacturing ensures an accurate fit. Best of all, BORLA® stands behind every system with a Million-Mile Warranty. Just what you’d expect from the world’s most experienced (and most winning) exhaust brand.