As a result of all of the upgrades compared to the previous generation LLY Duramax, the 2006 LBZ Duramax was the most reliable, efficient, and best-performing turbo diesel engine that GM created ...

Installing a freer-flowing turbo mouthpiece (usually from the ... The mid-2000s was a period of rapid iteration for GM's Duramax engine. The LLY only lasted a couple of years before GM debuted ...