Fitment Information GMC Sierra 2500 HD (2001, 2002, 2003, 2004, 2005, 2006) GMC Sierra 2500/3500 HD Classic (2007) GMC Sierra 3500 (2001, 2002, 2003, 2004, 2005, 2006) Engine Type: 6.0L V8  Emissions Compliance This intake has CARB EO Number: D-269-37. This applies to only the 2001-2006 GMC Sierra 2500/3500 HD. Specs & Features Estimated Horsepower Gain 20.34 HP @ 4894 RPM Guaranteed to increase horsepower and torque Roto-molded HDPE intake tube paired with oversized oiled cotton air filter Engineered to provide high airflow and exceptional filtration Replaces factory air filter and intake tube Filter only requires cleaning every 100,000 miles under normal highway driving conditions Typical installation can be completed in 90 minutes or less with simple hand tools 10-Year/Million Mile Limited Warranty„¢ Will not void vehicle warranty Product Description A high-density polyethylene (HDPE) rotationally-molded tube helps increase the volume of airflow to your engine, and provides a guaranteed increase in horsepower and torque. These systems are paired with a washable, reusable High-Flow Air Filter„¢ featuring oiled cotton filter media. The oversized, conical design allows you to go up to 100,000 miles between filter services under normal highway driving conditions. A custom heat shield helps protect intake air from the high temperature of your engine bay, and the entire system can typically be installed in less than 90 minutes. Some intakes are not legal for sale or use on any pollution controlled motor vehicle in California. See the product specifications for CARB status on each part for a specific vehicle. Redline360 sells only genuine and authentic K&N performance products.