3 Inch Cat Back Exhaust System Single Side Exit Aluminized Steel For 14-18 Silverado/Sierra 1500 MBRPYour 2014 2018 Chevrolet GMC 1500 has a ton of versatility, and MBRP's S5080AL cat back exhaust system can match that versatility. With improved durability, performance, sound and appearance you will feel confident with making the swap! Durability: Constructed from heavy gauged aluminized steel, our systems are fully sealed at the seams to help with rust resistance. Aluminized steel is optimal for mild and dry environments. Built to the same standards