Maximize the sound in your 2004.5-2005 Chevy/GMC 6.6L LLY Duramax with a Muffler Delete Pipe. A muffler delete pipe is easily installed in place of your existing muffler on most aftermarket exhaust systems and is simple clamped on both ends. Featuring a universal fitment, these pipes are available in a variety of lengths, materials, and diameters, to ensure they fit your specific 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!