Maximize the sound in your 2006-2007 Chevy/GMC 6.6L LLY/LBZ Duramax with a Muffler Delete Pipe. A muffler delete pipe simply installs in place of your existing muffler on most aftermarket systems and installs with clamps on both ends. Designed for a universal fitment, these pipes are made in a variety of lengths, diameters, and materials to offer an option for every application. For proper fitment and application, measure your current exhaust system diameter and muffler length. Then get the matching material grade to ensure your muffler replacement pipe is a match. Shop XDP and find Muffler Delete Pipes from the top manufacturers like MBRP, AFE, Magnaflow, and more!