2004.5-2005 GM Duramax 6.6L LLY Up-Pipes

Upgrading to a set of aftermarket up-pipes on your 2004.5-2005 GM 6.6L Duramax LLY is the perfect way to experience improved power and performance in every situation. These aftermarket up-pipes were engineered to lower Exhaust Gas Temperatures (EGTs) and maximize airflow which results in a boost in both horsepower and torque for your 2500/3500 GM truck. Perfect for those looking to add-on even more performance upgrades in the future, these high-quality up-pipes help reduce back-pressure for consistent and reliable performance without compromise. 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.