DS18 PRO-HA202 Bolt On 2" 27° 10.84" Depth Aluminum HornThe PRO HA202 is a full length throat designed to bring you maximum directional volume for your high powered drivers. This throat has a length of 11. 25 inches and an over all diameter of 9. 65 inches making it the biggest and most impressive throat available from DS18. This driver throat is the end all of driver throats and will ensure the loudest DB amplification possible all while turning heads because of the sleek and thoughtfully designed look