Exhaust Adapters will help your 2011-2016 Chevy/GMC 6.6L LML Duramax add the larger tip onto your stock exhaust. Y-pipes and exhaust reducers typically start at 3.5" and go all the way to 7" in diameter so that they can be used in a wide variety of applications. The adapters are available in stainless and aluminized steel to ensure they match the proper application and climate. Find high-quality products and components from MBRP, Magnaflow, and Silverline.