Check the listing for details. Chevy Silverado 99-06 Regular Cab Single Cab 2x12 Sub Box Subwoofer Enclosure. Condition: New. Listed at 249.00 USD. Enhance the sound quality in your Chevy Silverado Regular Cab with this 2x12 Sub Box Subwoofer Enclosure from Mega Bass. With its double ports and 12" speaker size, this enclosure is compatible with the Chevy Silverado Regular Cab model and can be conveniently installed behind the seat. Crafted in the United States, this subwoofer enclosure is the perfect addition to your car audio and video installation. It is designed for use with Chevrolet vehicles and is an ideal fit for those who appreciate high-quality sound. Upgrade your car's audio system today with this must-have accessory! 55 LONG X REAR12.5 HIGH X 5.75 TOP X 7.5 BOTTOM WOOFER CUT OUT 11.3" —-WOOFERS NOT INCLUDED. WE JUST SHOW THEM ON PICTURE SO YOU CAN SEE HOW IT LOOKS INSTALLED—