Universal Clamp On Filtr

The K&N Engineering Universal Clamp On Filter RU-5111 is a performance-oriented air intake solution designed for enthusiasts seeking improved engine breathing and filtration without permanent modifications to factory airbox systems. This universal clamp-on design appeals to builders, hot rodders, and engine swap projects where direct OEM filter replacements are impractical or unavailable. The RU-5111 bridges the gap between stock restrictive filters and full custom intake systems, offering a plug-and-play upgrade that maintains engine protection while enhancing airflow.

K&N's reusable filter technology relies on oil-coated cotton gauze media, which traps contaminants more effectively than disposable paper elements while permitting greater air passage. The universal clamp-on mounting system accommodates various intake tube diameters and configurations, with the compact 5 x 4.75 x 7.5-inch footprint fitting tight engine compartments typical of custom builds and retrofit applications. The lightweight 0.75-pound filter assembly minimizes added weight while its serviceable design—cleanable and reusable—reduces long-term ownership costs compared to conventional replaceable filters that require frequent disposal and repurchasing.

This filter suits engine swaps, turbo conversions, custom manifold projects, and non-standard intake manifolds where standard OEM part numbers no longer apply. Installation requires only positioning the filter at the intake source and securing the clamp mechanism—no cutting, welding, or permanent modifications needed. The RU-5111 performs best in applications with ambient airflow or ducted intake designs; users should verify clamp diameter compatibility with their specific intake tube before purchase to ensure proper seal and filtration efficiency.