The LLY also introduced an exhaust gas recirculation (EGR) system across the board for Duramax engines to help keep emissions ...

the LB7 Duramax doesn't have any of the emissions control hardware of later engines. This makes it a popular engine for diesel fans, as emissions technologies such as exhaust gas recirculation ...

After GM killed the project during its 2009 bankruptcy, an unused prototype V8 escaped the factory and made it into private hands. This is how it happened.