If we were to oversimplify how power is made, we’d say this: As more pressure is created in the cylinders, more torque is delivered to the wheels. That pressure can be a result of increased boost ...

Duramax LLY (2004 - 2005) GM debuted a revised engine, the LLY, mid-way through 2004 for the Chevy Silverado and GMC Sierra 2500HD/3500HD — thus the "2004.5" model year that diesel enthusiasts often ...