Does NOT fit the Navigator L with the 131.6" Wheelbase. This 2.5" diameter Cat-Backâ„¢ 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-Backâ„¢ & 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 youâ€d expect from the worldâ€s most experienced (and most winning) exhaust brand.