Univ. Air Fil. 2 X 3-1/8

The K&N Engineering universal air filter element 2 x 3-1/8 is a premium reusable intake component designed for enthusiasts and mechanics seeking superior airflow and filtration across a wide range of engine builds. This clamp-on conical filter serves as a direct replacement or upgrade for stock air boxes, custom intake manifolds, and performance carburetors where standard paper filters restrict breathing. Built for durability and longevity, this universal design accommodates custom fabrication projects, allowing users to optimize intake velocity and engine responsiveness without frequent filter replacements.

Engineered with K&N's proprietary reusable cotton media, this filter element delivers washable, long-life filtration that outperforms disposable alternatives in both service life and airflow characteristics. The conical design provides optimal surface area for reduced restriction while maintaining effective particle capture—critical for naturally aspirated and boosted applications alike. Its 3.125-inch base diameter tapers to a 2-inch top diameter with a 3-inch height, fitting compact engine bays and custom intake configurations. The red cotton media is clearly visible for easy maintenance inspection, and the 2-inch flange design ensures secure clamping without vibration or movement during operation. Weighing just 0.45 pounds, the minimal mass reduces inertial load and allows for lightweight intake fabrication.

Mechanics and performance builders favor this universal element for carbureted engines, motorcycle intakes, ATV builds, and street rod projects where intake diameter varies from standard. The reusable cotton construction makes it ideal for high-mileage vehicles and cold-weather operation—conditions where paper filters can degrade or fail. Installation requires basic hose clamps and takes minutes; the filter can be cleaned with compressed air or gentle hand washing, then re-oiled with K&N filter oil for immediate redeployment. Dimensions of 4.7 x 4.4 x 5 inches make routing in tight engine compartments feasible for both OEM and custom applications. For users prioritizing sustained airflow gains and cost-effective long-term maintenance, this element delivers measurable intake efficiency improvements over its service life.