Collection: 2004.5-2005 GM 6.6L LLY DURAMAX

Starting with the 2004.5 Duramax LLY model (and remaining relatively unchanged in the 2005 Duramax), GM introduced variable geometry turbos for the first time. Despite numerous changes in Heavy Duty GM's over the years, they have kept the platform relatively unchanged, building trust with buyers. There are plenty of upgrades available for your truck.