2001-2004 GM 2500HD/3500HD 6.6L LB7 Duramax Mufflers

Whether your diesel truck's factory muffler is worn out or you're looking to customize its sound, Alligator Performance is your go-to source for premium universal mufflers that meet all your needs. We offer a wide range of mufflers with various internal designs, lengths, diameters, materials, exit styles, and finishes, so you can find the ideal match for your build. From ultra-quiet chambered mufflers to aggressive straight-throughs and loud race mufflers, we have the perfect options to help you fine-tune the exhaust note of your Cummins.  GM Duramax Fitments: 2001, 2002, 2003, 2004 GM 6.6L Duramax. Submodel Fitments: WT, Custom, LT, LTZ, High Country, 1LT, 2LT, Pro, SLE, SLT, AT4, Denali. Some exceptions apply, please see individual product pages for specific fitments.