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: Gunmetal Gray Powdercoat;State Legal: 50 State CARB Approved; Not CARB Legal for 2004-2006 3500, 2004 GMC Sierra 2500, and 2006 Silverado 1500 models equipped with 6.0L CADILLAC CHEVROLET GMC AVALANCHE 1500 ESCALADE ESCALADE ESV ESCALADE EXT SIERRA 1500 SIERRA 1500 CLASSIC SIERRA 1500 HD SIERRA 1500 HD CLASSIC SIERRA 2500 SIERRA 2500 HD SIERRA 2500 HD CLASSIC SIERRA 3500 SIERRA 3500 CLASSIC SILVERADO 1500 SILVERADO 1500 CLASSIC SILVERADO 1500 HD SILVERADO 1500 HD CLASSIC SILVERADO 2500 SILVERADO 2500 HD SILVERADO 2500 HD CLASSIC SILVERADO 3500 SUBURBAN 1500 SUBURBAN 2500 TAHOE YUKON YUKON XL 1500 YUKON XL 2500 BASE CLASSIC DENALI CLASSIC HYBRID CLASSIC LS CLASSIC LT CLASSIC SL CLASSIC SLE CLASSIC SLT CLASSIC SS CLASSIC WT DENALI HT HYBRID LS LT LTZ NORTH FACE ON ROAD EDITION SL SLE SLT SS WBH WT Z66 Z71 1999 2000 2001 2002 2003 2004 2005 2006 2007 4.8L GEN III LR4 Vortec (294) 5.3L GEN III Electric/Gas LM7 (325) 5.3L GEN III Flex L59 Vortec (325) 5.3L GEN III L33 Vortec (325) 5.3L GEN III LM7 Vortec (323) 5.3L GEN III LM7 Vortec (325) 6L GEN III Bi-Fuel LQ4 Vortec (364) 6L GEN III CNG LQ4 Vortec (364) 6L GEN III LQ4 Vortec (364) 6L GEN III LQ9 HO Vortec (364) BI-FUEL CNG ELECTRIC/GAS FLEX GAS AEM AEM Brute Force Air Intake System - 21-8000DC 21-8000DC Air Intake Kits