Spectre Performance HPR9606B Universal Clamp-On Air Filter: Round Tapered; 6 in (152 mm) Flange ID; 5.719 in (145 mm) Height; 7.219 in (183 mm) Base; 3.906 in (99 mm) Top Engineered for increased flow and greater performance Factory pre-oiled and ready to use Quality materials used throughout including synthetic media, urethane, and steel mesh Use P/N HPR4820 Accucharge kit to clean and re-oil the filter Use with a velocity stack to fit 2-1/2 (9601), 3 (9602), 3-1/2 (9603), or 4 (9604) intake tubing