The **Q-Power 12"** subwoofer enclosure box is custom made for GMC and Chevy Extended Cab trucks, model year 1999 to 2006. This enclosure is designed to fit underneath the rear seats and boasts .95 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. PLEASE NOTE: This Sub Box is made to fire downward