K&N Universal Round Tapered Filter 6in Flange ID x 7-1/2in Base OD x 4-1/2in Top OD x 9in HeightK&N's universal inverted dome filters are engineered to provide exceptional airflow and an increase in engine performance. They are designed and tested using computational fluid dynamics (CFD) analysis, flow bench analysis, and dynamometer testing, and incorporate a unique inverted cone design that helps direct a high level of airflow to the throttle body. Manufactured for a wide variety of applications and unique filtration needs, K&N universal clamp