Open Funnel Performance Air Filter 4.5in Inlet

The Open Funnel Performance Air Filter with 4.5-inch inlet is a universal-fit, clamp-on conical air filter element engineered to maximize airflow while maintaining reliable filtration for performance applications. This cotton-media filter combines a 5.75-inch base with a tapered design that reduces air turbulence, making it suitable for custom intake setups where standard housing configurations don't apply. The blue cotton construction offers superior dirt-holding capacity and extended service life compared to paper alternatives in high-flow environments.

With a 4.75-inch top diameter and 6.375-inch height, this performance air filter element delivers optimized flow characteristics for engine modifications, custom fuel-injected builds, and aftermarket intake manifolds. The 4.5-inch flange ensures secure clamp mounting on compatible intake tubes. Cotton-element filters provide washable, reusable performance—critical for builders who need to maintain peak engine efficiency without the recurring expense of disposable paper elements. The conical shape naturally guides air through the media while minimizing flow restriction at the inlet.

This universal air filter element serves engine enthusiasts, custom builders, and performance shops requiring a high-flow alternative for non-standard intake configurations. It's particularly valuable in applications where OEM air box assemblies have been removed or replaced with tuned intake manifolds. The cotton media withstands multiple cleaning cycles without degradation, making it cost-effective for frequent drivers and weekend enthusiasts alike. Weighing just 1.12 pounds, installation and removal are straightforward with standard clamp hardware.