If you want to maintain a factory appearance the aFe Stage 2 Si Sealed Air Box provides quiet performance and industry-leading power gains. *Features* * *Ram Air Scoop* - Built-in ram scoop forces cold air to filter for greater efficiency and performance gains. * *Clamp Stops* - Raised stops on aFe tubes provide a more secure seal and eliminate slippage versus flat, straight tubes. * *3-Angle Adapter* - Specially developed velocity stack with 3 different angles dramatically increase airflow from the filter to the intake tube. * *Quality Hardware* - aFe uses only top-quality hardware like stainless steel button head bolts and brass inserts. * *MAF Sensor Pad* - Precision tuned MAF Sensor Pad will not affect vehicle performance or produce check engine light warnings. * *3 Filter Media Choices* - Choose from the Pro 5R, Pro Dry S or Pro-GUARD 7 Filter. PartNumber : afe50-74001 Description : Momentum HD Intake System 2001-2004 Chevrolet Silverado 2500 HD Base V8.6599cc Air Intake Systems::Cold Air Intakes 2001-2004 Chevrolet Silverado 2500 HD LS V8.6599cc Air Intake Systems::Cold Air Intakes 2001-2004 Chevrolet Silverado 2500 HD LT V8.6599cc Air Intake Systems::Cold Air Intakes 2004 Chevrolet Silverado 2500 HD WT V8.6599cc Air Intake Systems::Cold Air Intakes 2001-2004 Chevrolet Silverado 3500 Base V8.6599cc Air Intake Systems::Cold Air Intakes 2001-2004 Chevrolet Silverado 3500 LS V8.6599cc Air Intake Systems::Cold Air Intakes 2001-2004 Chevrolet Silverado 3500 LT V8.6599cc Air Intake Systems::Cold Air Intakes 2004 Chevrolet Silverado 3500 WT V8.6599cc Air Intake Systems::Cold Air Intakes 2002-2004 GMC Sierra 2500 HD Base V8.6599cc Air Intake Systems::Cold Air Intakes 2001-2002 GMC Sierra 2500 HD SL V8.6599cc Air Intake Systems::Cold Air Intakes 2001-2004 GMC Sierra 2500 HD SLE V8.6599cc Air Intake Systems::Cold Air Intakes 2001-2004 GMC Sierra 2500 HD SLT V8.6599cc Air Intake Systems::Cold Air Intakes 2003-2004 GMC Sierra 2500 HD WT V8.6599cc Air Intake Systems::Cold Air Intakes 2002-2004 GMC Sierra 3500 Base V8.6599cc Air Intake Systems::Cold Air Intakes 2001-2002 GMC Sierra 3500 SL V8.6599cc Air Intake Systems::Cold Air Intakes 2001-2004 GMC Sierra 3500 SLE V8.6599cc Air Intake Systems::Cold Air Intakes 2001-2004 GMC Sierra 3500 SLT V8.6599cc Air Intake Systems::Cold Air Intakes 2004 GMC Sierra 3500 WT V8.6599cc Air Intake Systems::Cold Air Intakes