Unlock the full potential of your 2004.5–2005 GM 6.6L LLY Duramax diesel engine with premium performance parts built to deliver power, reliability, and longevity. Whether you're driving a Chevy Silverado 2500HD/3500HD or a GMC Sierra 2500HD/3500HD, our curated selection of LLY-specific components is designed to meet the demands of serious diesel enthusiasts. From the rugged Powermaster Ultra Duty Diesel Starter for confident cold starts to the race-proven PPE Diesel Main Stud Kit and Carrillo Rods for bulletproof bottom-end strength, every part is engineered for performance. Enhance fuel delivery and boost response with our premium fuel and turbo components, and keep your engine running clean and smooth with trusted oil treatments and additives. Whether you're towing, racing, or daily driving, these upgrades will help your 6.6L LLY Duramax run stronger, longer.
