Spectre's Chrome Round Air Cleaners are designed to fit carburetors and throttle body injection assemblies with a 5-1/8 inch inlet. Engineered to maximize air flow, this assembly includes a round 6-3/8 inch by 2-1/2 inch Spectre HPR paper air filter with flame resistant media. The triple chrome-plated filter lid is fabricated from high quality steel featuring a smooth design.