K&N Universal Rubber Filter 4inch FLG / 6inch OD-B / 4-5/8inch OD-T / 14inch H

K&N Universal Rubber Clamp-On Air Filter | 4" Inlet, 14" Tall

Boost performance with the K&N Universal Rubber Air Filter (4" Flange, 6" Base, 4-5/8" Top, 14" Height). High-flow, washable, and built to last.

Engineered to maximize airflow while delivering uncompromised filtration, the K&N Universal Rubber Air Filter is built for custom, high-performance applications. Designed around a round tapered silhouette, this extra-tall 14-inch filter provides a massive surface area of multi-layered, oiled cotton gauze media. The breathable media captures microscopic contaminants without choking engine intake.

Constructed with an ultra-durable, pliable molded rubber flange, this clamp-on filter effectively absorbs heavy engine vibrations while ensuring a snug, leak-free seal on 4-inch intake tubing. The flexible rubber flange can also stretch up to 1/16 of an inch (1.5mm) to accommodate minor sizing variations in custom setups. Fully washable and reusable, this K&N filter is a long-lasting, eco-friendly replacement for disposable paper filters.

Best Uses

1. Custom Cold Air Intakes: Ideal for fabricators and DIY builders routing 4-inch custom intake piping.
2. Performance & Race Vehicles: High-horsepower track, drag, or street builds needing high-volume air volume capacity.
3. Forced Induction Systems: Turbocharged or supercharged engines demanding minimal intake restriction.
4. Off-Road & Specialty Machinery: Custom buggies, tractors, and industrial generators requiring reliable dust and dirt filtration.

Features

1. Precision Dimensions: Features a 4-inch Flange Inside Diameter (ID), 6-inch Base Outside Diameter (OD), 4-5/8-inch Top OD, and a 14-inch overall height.
2. Premium Oiled Cotton Media: Multi-layered, pleated cotton treated with specialized filter oil to trap dirt while maximizing airflow.
3. Vibration-Absorbing Rubber Flange: Pliable molded rubber flange dampens engine movement and allows up to 1/16-inch (1.5mm) stretch for easy fitment.
4. Washable & Reusable: Designed to be cleaned and re-oiled for repeated use, lasting up to 50,000–75,000 miles between services under normal conditions.
5. Clamp-On Design: Simple mounting mechanism securing directly to 4-inch intake pipes or throttle bodies via standard hose clamps.

Benefits

1. Increases Horsepower & Acceleration: High-flow media lowers air restriction to supply your engine with cooler, denser oxygen for instant throttle response.
2. Extended Service Life: Replaces endless disposable paper filters with a single unit designed to last the lifetime of your vehicle.
3. Superior Engine Protection: Oiled cotton mesh creates a sticky barrier that traps airborne dust, grit, and debris without sacrificing airflow.
4. Flexible Custom Installation: The pliable flange makes fitting onto custom 4" intake pipes fast, forgiving, and secure.
5. Cost-Effective & Eco-Friendly: Reduces long-term maintenance costs and minimizes landfill waste from single-use filters.