2004.5-2005 GM 2500HD/3500HD 6.6L LLY Duramax Exhaust Upgrades

Our exhaust systems for the 2004.5-2005 GM 6.6L Duramax LLY are the perfect solution for enhancing your GM 2500HD/3500HD with an aggressive exhaust note and improved performance. These high-quality, street-legal and off-road exhaust kits feature more efficient designs compared to your factory system, allowing your 6.6L Duramax LLY engine to breathe freely. Our kits are engineered to deliver significant gains in both horsepower and torque without the need for additional tuning, providing an immediate performance boost. Along with their impressive power enhancements, these premium aftermarket exhaust kits produce a powerful tone that’s sure to turn heads. We offer a variety of options, including single-exit kits, dual-exit kits, up-pipes, downpipes, and universal exhaust tips to ensure your entire exhaust system looks and performs exactly how you want it! Pair your new exhaust system with our selection of Turbo Upgrades! GM Duramax Fitments: 2004, 2005 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.