Borla Cat-Back and Rear Section exhaust systems feature patented straight through and multi-core technology to unleash hidden horsepower. Increased exhaust velocity adds power; driving excitement; fuel economy; and the distinctive Borla Sound of power respected enthusiasts everywhere. Each system is built from premium 300 series austenitic stainless steel; superior to T-400 series knockoffs; to give you the absolute best in performance and durability. Ultra smooth mandrel bends ensure maximum flow and power; and precision computer controlled CNC manufacturing ensures an accurate fit. Best of all Borla stands behind every system with a Million-Mile Warranty. Just what you would expect from the worlds most experienced and most winning exhaust brand. Touring Cat-Back Exhaust System. Million Mile Warranty 2009-2018 Ram 1500 5.7L V8 Auto Transmission 2 & 4WD Regular Cab or 4-Door Extended Cab-Standard Bed (76.3")/Crew Cab-Short Bed (67.4") "Through Bumper"