2004.5-2005 GM Duramax 6.6L LLY Cold Air Intakes

The 6.6L Duramax LLY equipped on your 2004.5-2005 GM Sierra/Silverado might be one of the most efficient engines on the market; however, it's always hungry for more air. An aftermarket cold air intake is the best way to deliver an increase in both power and performance to your 6.6L Duramax engine. The right cold air intake system provides large volumes of cold, clean air to your diesel engine which results in improved power, performance, and throttle response for every situation. Most of these aftermarket intakes kits come standard with larger air filters that better protects your 6.6L Duramax engine from contaminants, promoting long-lasting engine and component life without compromise. All of these GM 2500/3500 intake systems are super easy to install, letting you add some drop-in power in a hassle-free package. 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.