FOR SILVERADO/SIERRA/DENALI 2007-2019, F150 1999-2020, TUNDRA DOUBLE CAB 2018-2020, AND MORE Double the output! Add this optional modular port enclosure for an extra 6dB bass extension to your TXTRB10 subwoofer enclosure. Features: Roadkill-Armor Coat Permanent Heat Bonded EPM enclosure coating (Elastomeric Polyurethane Molecule) Weather-Resistant for harsh outdoor environments Sound Dampening Properties for resonance reduction Scratch, Crack, and Peel-Resistant Chemical and Stain-Resistant Impact Absorption UV Protection Provides Leak and Corrosion Prevention Heavy Duty 11-Layer High-Density Plywood Construction Durable, Coated Steel Subwoofer Grill for Extra Protection Includes all mounting hardware