Quad 8" Ported Subwoofer Enclosure For CHEVY Silverado and GMC Sierra
HD 8" Subwoofer | Car Audio Equipment | American Bass
BOSS Audio Systems CUBE8 8 Inch Car Audio Subwoofer and Amplifier Package – Powered, Built-in Amplifier, Passive Radiator, Remote Subwoofer Control, For Truck, Boxes and Enclosures