The AFE 51-74002 Pro Dry S Momentum HD Intake System for your 2004.5-2005 GM 6.6L Duramax increases power, performance and flow! Bringing you the next generation of intakes, the Momentum HD sealed air intake system is designed using the most up-to-date engineering tools and techniques to provide you with the perfect blend of power and protection. From the one-piece sealed housing to the massive Pro DRY S air filter and premium hardware, we spared no expense to give you the best intake on the market.Unique One-Piece Housing:The smooth one-piece sealed housing with auxiliary air scoop is used to eliminate the use of multiple-piece housings and ensure the coolest air intake charge available. A urethane plug is also included for extreme conditions when you want to block the auxiliary air scoop. A large, stainless steel plate is used for an aggressive style.