To extend this system to fit the longer Double (Crew) Cab With Long Bed (6' 1") 140.6" Wheelbase models use adapter 60593. This 2.5" diameter BORLA Cat-Backâ„¢ system features a 4" round bright chrome on T-304 stainless steel tip. A system with a black chrome on T-304 stainless steel tip and a High Clearance Climber / Rock Crawler system are also available. The system delivers the classic S-Type sound with no drone inside he vehicle. 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 you'd expect from the world's most experienced (and most winning) exhaust brand.