Spectre Performance 8136 Universal Clamp-On Air Filter: Round Tapered; 3 in/3.5 in/4 in (102 mm/89 mm/76 mm) Flange ID; 6.719 in (171 mm) Height; 6 in (152 mm) Base; 4.75 in (121 mm) Top High flow filter designed to fit 3 inch, 3 1/2 inch and 4 inch tubes Quality materials used throughout including washable. oiled synthetic media, urethane, and steel mesh Factory pre-oiled and ready to use Includes adapter rings Blue synthetic filter media