The Q-Power 12" subwoofer enclosure box is compatible with 2007, 2008, 2009, 2010, 2011, 2012, and 2013 Chevy Silverado Crew Cab and GMC Sierra Crew Cab. This enclosure is designed to fit underneath the rear seats and boasts .90 cubic feet of air space. The Q-Power 12" subwoofer box is made from solid 5/8" MDF construction and features charcoal carpet covering, and terminal cup connectors. Turn your ride into a sound machine with the help of the Q-Power 12" Subwoofer Enclosure! If you want the most output for your money, this is the way to go...... Dimensions: 50.5" (W) x 16" (H) x 5"-9" (Top D-Bottom D) Downfire Design 2-year Warranty: (1-year Manufacturer + 1-year VMInnovations)