Collection: 2004.5-2005 Duramax LLY 6.6L

Take your truck to the next level. Introduced midway through 2004, the 6.6L LLY Duramax brought exciting upgrades to the platform, including a larger variable-geometry turbocharger (VGT) for faster spooling and crisp throttle response, alongside easily accessible externally mounted fuel injectors. It remains a legendary choice for drivers demanding heavy-duty towing muscle and massive street performance.

Whether you are looking to fix common factory restrictions, maintain a reliable daily driver, or build a high-horsepower rig, find everything you need here.