Bbox Single Vented 10 Inch Subwoofer Box - Premium Subwoofer Box Improves Audio Quality, Sound & Bass - Fits 2007 & up Chevrolet/GMC Silverado/Sierra Crew Cab - Car Subwoofer Boxes & Enclosures 10" Single Vented 2007 - 2021 is up for auction in Automotive. The current bid is $4.00, 96% below the $108.00 MSRP, in As Is condition. This auction has ended — similar items appear in live auctions regularly.