Looking for an edge on the competition? The AFE 50-74002 Pro 10R Momentum HD Cold Air Intake is exactly what you need. This bad boy is designed specifically for the LLY Duramax 2004.5-2005 and offers increased airflow, improved power, and protection against debris. The one-piece housing is constructed from premium materials and the washable/reusable air filter make maintenance a breeze. Not to mention, it outflows the factory intake by 43% and resulted in 19 additional horsepower and 33 lbs. x ft. torque. So if you're serious about taking your game to the next level, this is the cold air intake for you.