Universal Air Filter

The K AND N ENGINEERING Universal Air Filter (RU-1785) is a high-flow replacement element designed for enthusiasts and mechanics seeking improved engine breathing without sacrificing durability. This clamp-on style air filter replaces restrictive OEM elements across countless vehicle platforms, making it an ideal upgrade for both daily drivers and performance builds. Whether you're tuning a truck for towing capacity or maximizing horsepower in a sports car, this reusable cotton filter delivers measurable gains in airflow while maintaining superior filtration—a critical balance that separates quality aftermarket components from budget alternatives.

Built from premium oiled cotton media, the Universal Air Filter uses K&N's proprietary three-layer construction to capture contaminants while allowing significantly more air volume than paper filters. The 5-inch diameter element stands 8.5 inches tall with a 3.5-inch flange, engineered to fit a wide range of intake manifolds and aftermarket air box configurations. The red-finished cotton is treated with a specialized oil that traps particles as small as 10 microns while the open-weave design minimizes airflow restriction—directly translating to improved throttle response and fuel atomization in the combustion chamber. Unlike disposable paper alternatives, this reusable filter can be cleaned with K&N's proprietary cleaning solution and re-oiled, eliminating recurring replacement costs over the vehicle's service life.

This universal design benefits custom builders, mechanics performing multi-vehicle fleet maintenance, and owners upgrading intake systems on older platforms where OEM parts are scarce or expensive. Installation requires only a hose clamp (not included) and takes minutes on most applications—no drilling, permanent modification, or ECU recalibration needed. The lightweight 1.3-pound construction minimizes unsprung mass while the compact 6.55 x 6.5 x 11-inch footprint accommodates tight engine bays. Verify your intake tube diameter and clamp compatibility before purchase to ensure proper fitment, as this element's universal nature demands manual confirmation against your specific intake ducting.