We supply OEM-brand fuel-system and engine components for Chevrolet and GMC Duramax 6.6L diesels across the LB7, LLY, LBZ, LMM, and LML platforms - fuel injectors, CP3 and CP4 pumps, Garrett turbochargers and actuators, and sensors. As an authorized dealer for Bosch and Garrett, we stock genuine parts, many with no core charge and free shipping over $1,000. Because Duramax parts vary by generation, verify fitment against your engine code and OEM cross-reference before ordering.