Banks5 inch aluminized steel constant-diameter DPF-back exhaust system with patented negative-backpressure SideKick tip. Improves throttle response and fuel economy by lowering backpressure up to 9 percent at the turbine inlet. Allows the engine to exhale and breathe more efficiently and redirects hot exhaust gas to the side.Preventstrailer meltdown with 15 percent lower temps behind the tip. Includes huge chrome or Cerakote Black obround SideKick tip. Up The Flow. With the stock exhaust nozzle measuring 2.85-inch compared to the Monster Exhausts massive 5-inch outlet, the Banks system offers a 192 percent greater flow area than stock. The Monster Exhaust boasts 85 percent less backpressure than stock, leading to more power and increased fuel economy. Change Your Look. Duramax owners can choose from two huge patented 6.5 x 7.5-inch ob-round slash-cut exhaust tips: chrome-plated polished stainless steel or high-temp Cerakote matte black. And, unlike other brands, Banks' Cerakote black tip will not turn brown with heat. Drop That Heat. The Monster Exhaust also provides a 15 percent reduction in exhaust temperature two feet behind the tip during regen! The Diesel Particulate Filter (DPF) on the Duramax L5P is cleaned through regeneration in which scorching exhaust gas temperatures can last up to 20 minutes while driving. Unlike the stock Duramax exhaust, which directs a prolonged jet-like blast of super-heated exhaust gas directly at anything being towed, the Monster Exhaust is aimed out to the side of the truck. This allows ambient air to diffuse the heated gas, eliminating the risk of melting a trailer, which has been reported by many Duramax owners.