For Maverick X3 2017 and up SSV Works custom molded sub enclosure is designed for a 10" subwoofer and easily installs under the Passenger seat. No brakeline modification required! The box simply mounts to the frame above the floor . They are 100% fiberglass for the best sound quality and bass response. They are finished in a black texture coat to match textures and can be custom painted to match your color scheme. - Includes stainless mounting hardware and step-by-step installation instructions.