LLY Duramax Cold Air Intakes

Improve engine breathing, lower exhaust gas temperatures (EGTs), and eliminate notorious factory airflow restrictions on your 2004.5–2005 Chevy Silverado or GMC Sierra 2500HD/3500HD with our selection of LLY Duramax cold air intake systems. The factory intake tract on the 6.6L LLY—specifically the restrictive OEM airbox and notoriously choked turbo inlet mouthpiece—drastically limits airflow to the Garrett variable-vane turbo, contributing to elevated operating temperatures and sluggish throttle response under heavy towing. Upgrading to an engineered cold air intake delivers a steady volume of cool, oxygen-rich air, improving combustion efficiency, turbo spool-up, and fuel economy. We supply fully enclosed intake systems, reusable oiled filters, dry extendable-media filters, and pre-filter wraps from top manufacturers like S&B Filters, Banks Power, and aFe Power. Browse our LLY Duramax cold air intakes below to unlock cleaner power and cooler engine temps.