2001-2006 Chevy Silverado / GMC Sierra HD Crew Cab Dual 10 Downfire Subwoofer Box Fits 2001-2006 Silverado and Sierra 2500 & 3500 4-Door Crew Cab Trucks Holds Two 10" Subs and Fires Down with 2" of Clearance Underneath No modifications to vehicle are required, must move jack, see note below Volume: .55 cu.ft. per chamber, Mounting Depth: 5.75" Finish: Charcoal Gray Carpet as shown, Speaker terminals installed