2004.5-2005 GM Duramax 6.6L LLY Single-Exit Exhaust Kits

If you're looking to bring a whole new appeal to your 2004.5-2005 GM 6.6L Duramax LLY build with a brand new exhaust sound, look no further than these premium single-exit cat-back kits. The aftermarket exhaust systems we offer were crafted using advanced design technologies and only high-quality materials to help maximize airflow and performance gains in every situation. Many of these kits come equipped with aggressively styled tips and powerful mufflers, while others come standard without an exhaust tip so you can choose your desired look. Pair any of these systems with an aftermarket cold air intake or performance tuner to unlock even more potential hidden under the hood of your GM 2500/3500. 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.