Brute Force Intake System Filter Housing Type: Partial Enclosure;Filter Type: Dry;Inlet Tube: Included;Filter Housing Material: Steel;Filter Housing Finish: Black;Intake Tube Material: Aluminum;Intake Tube Finish: Polished;State Legal: 50 State CARB Approved;Not Approved for 2002-2005 Avalanche 2500 models with 8.1L engine CHEVROLET GMC AVALANCHE 2500 SIERRA 2500 HD SIERRA 3500 SILVERADO 2500 HD SILVERADO 3500 BASE LS LT SL SLE SLT WT 2001 2002 2003 2004 2005 8.1L L18 Vortec (496) GAS AEM AEM Brute Force Air Intake System - 21-8014DP 21-8014DP Air Intake Kits