Q Power GMC10DF Dual 10" Subwoofer Enclosure for 1999-2006 Chevy Silverado and GMC Sierra Extended Cab Trucks Custom Fit Truck Dual 10" Subwoofer Enclosure For 1999-2006 Chevy Silverado and GMC Sierra Extended Cab Trucks Under Seat Down Firing Subwoofer Design for Maximum Bass Independent Subwoofer Chambers Finished in a Charcoal Color Carpet