Engineered specifically for 2006 through 2007 Chevrolet Silverado 2500HD/3500 and GMC Sierra 2500HD/3500 trucks powered by the 6.6L Duramax V8 turbo diesel engine (LBZ and late LLY codes), the aFe Momentum HD Cold Air Intake System (Part # 51-74003) is designed for drivers who prefer the convenience of an oil-free, washable synthetic filtration media. Factory intake boxes on common-rail diesels restrict high-volume airflow under demanding towing and performance tuning applications.

The aFe Momentum HD system solves this by enclosing a massive 360-degree radial flow Pro DRY S filter inside a unique one-piece sealed roto-molded housing. This design captures cool ambient air directly from the front of the truck while blocking hot under-hood engine air. Featuring a clear sight window for effortless filter inspection and premium stainless steel hardware, this bolt-on kit installs seamlessly using factory mounting locations with zero core charge.

Key Features & Benefits

• +57% Airflow Increase: Outflows the restrictive factory airbox significantly, reducing turbo spool lag and lowering exhaust gas temperatures (EGTs).
• Proven Dyno Gains: Delivers measured laboratory gains of up to +21 horsepower and +56 lbs. x ft. of torque.
• Oil-Free Pro DRY S Air Filter: Utilizes a huge progressive synthetic media featuring 3 layers of oil-free synthetic mesh, offering 99.2% cumulative filtration efficiency and easy soap-and-water cleanup.
• Unique One-Piece Sealed Housing: Roto-molded XLPE housing features an integrated auxiliary air scoop and a clear sight window for quick visual filter checks without disassembly.
• Dyno-Tuned Intake Tube: Computer-designed, heat-resistant cross-linked polyethylene (XLPE) intake tube ensures a smooth, turbulent-free air charge into the turbocharger.
• Zero Core Charge: Brand-new outright performance upgrade requiring no core deposit or core return shipping.

Technical Specifications

• Manufacturer / Brand: Advanced FLOW engineering (aFe Power)
• Manufacturer Part Number / SKU: 51-74003
• Product Series: Momentum HD Series Stage-2 Si
• Filter Media Type: Pro DRY S (3-Layer Progressive Oil-Free Synthetic Media)
• Housing Material: Heat-Resistant Roto-Molded XLPE Polymer
• Hardware Included: Premium 2-ply reinforced silicone hump coupler and stainless steel T-bolt clamps
• Truck Platform: 2006–2007 GM 2500HD / 3500 Silverado & Sierra
• Engine Platform: 6.6L Duramax V8 Turbo Diesel (LBZ / LLY Codes)
• Core Requirement: None
• Warranty: aFe Power 2-Year Limited Warranty

Vehicle Fitment & Technical Installation Notes

• 2006–2007 Chevrolet Silverado 2500HD / 3500 – 6.6L Duramax Diesel (LBZ & LLY)
• 2006–2007 GMC Sierra 2500HD / 3500 – 6.6L Duramax Diesel (LBZ & LLY)
• Fits Model Years: 2006, 2007 (Classic body styles with LBZ/LLY engines)
• Installation Simplicity: Designed with fewer overall components than multi-piece intake systems, allowing for a fast, straightforward bolt-on installation using factory mounting locations with no cutting or drilling required.
• Maintenance Tip: Inspect the filter condition periodically through the clear housing window. When servicing, simply tap out loose debris or wash the Pro DRY S synthetic filter with mild soap and water, let air dry completely, and reinstall—no filter oil required.