2004.5-2005 6.6L LLY Duramax Parts

The Duramax LLY was introduced to the market mid-way through 2004 and due to changes in the industry and the rising standards in emissions regulations, its lifespan was shortlived. However, even though it wasn’t around long, it made its mark by introducing new technologies. The LLY in Duramax LLY is an RPO (Regular Production Option) code indicating that the engines with that designation came with EGR (Exhaust Gas Circulation) on them. EGR controls NOx emissions by lowering the oxygen concentration in the combustion chamber, as well as through heat absorption. +Read more

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