Our predator performance air filter adapter utilizes a billet aluminum structure with a ribbed outer filter mounting surface for added grip and durability when mounting your air filter. When used with our high flow air filter, upgraded jet and performance header pipe, this product will amp up your 6.5 horsepower Honda gx200, 212cc predator, 196cc clone, as well as your Trailmaster Mini and Mid off road karts . Outside diameter is 2 7/16 inches. Fits both Hemi and Non Hemi engines.