2004.5-2005 GM Duramax 6.6L LLY Exhaust Manifolds

The stock exhaust manifold on your 2004.5-2005 GM 6.6L Duramax funnels exhaust gases from each cylinder and routes them to your truck's catalytic converter, ensuring consistent and reliable performance of your engine and it's components. When the OEM manifold starts to wear, the engine valves will slowly but surely become damaged, leaving you with additional hassles down the road. In order to prevent this from happening, we recommend investing in one of the premium exhaust manifolds we offer here at Alligator Performance! These turbo manifolds are premium replacements of your stock assembly so you can unlock the full potential out of your Sierra/Silverado 2500/3500HD. 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.