Borla 14 Silv/Sierra 1500 C/B Touring Exh/2.75in in muff 2.25inout 4inTIp SS Rear ExitBorla 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.