Universal Air Filter 6in FLG 7-1/2inB 4-1/2inT

The K and N Engineering Universal Air Filter 6in FLG 7-1/2inB 4-1/2inT (RF-1048) is a reusable cotton air filter element designed for universal applications where direct bolt-on filtration is required. Built with a conical geometry and a 6-inch flange, this filter accommodates engine bays with constrained mounting space while maintaining effective air circulation through its 7.5-inch base diameter tapering to a 4.5-inch top. The 6-inch height integrates into standard clamp-on manifold configurations used across multiple engine platforms.

The reusable cotton construction distinguishes this filter from disposable paper alternatives. Cotton media provides improved airflow characteristics while supporting multiple service cycles—the element can be cleaned and re-oiled according to K and N maintenance protocols, reducing long-term consumable costs. The conical shape maximizes surface area relative to the package dimensions, translating to lower restriction and extended service intervals between cleaning cycles. Red powder-coated finish indicates the standard K and N aesthetic and provides corrosion resistance in wet or salt-laden environments.

This universal air filter suits builders integrating non-OEM intake manifolds, custom intake systems, or applications where factory air boxes have been removed for space or performance reasons. The 6-inch flange diameter works with standard velocity stack adapters and carbureted or fuel-injected engine configurations. Users should verify base and top opening compatibility with their specific intake ducting before installation. The lightweight construction (1.5 lbs) minimizes underhood mass without compromising filtration integrity or structural rigidity during operation.