Introducing the Banks Power 48947 Single Monster Exhaust System for your L5P Duramax 2017-2019. This system is constructed from 4" stainless steel for durability and strength, and features mandrel-bent constant diameter tubing for optimum flow. It also includes a black or polished exhaust tip for a custom look. Lower exhaust gas temperatures are achieved thanks to the large diameter tubing, resulting in improved performance and fuel economy. This system is the perfect way to get the most out of your Duramax engine.