K&N Universal Clamp-On Air Filter 2.25in Flange ID 3.5in OD 2in Height

K&N Universal Clamp-On Air Filter | 2.25" Flange, 3.5" OD, 2" Height (RU-1900)

Boost performance with the K&N Universal Clamp-On Air Filter (RU-1900). Features a 2.25in Flange ID, 3.5in OD, 2in Height, washable oiled cotton media, and high airflow capacity.

The K&N Universal Clamp-On Air Filter RU-1900 is engineered to increase horsepower and acceleration by allowing higher airflow into your engine while maintaining exceptional filtration efficiency. Constructed with multiple layers of oiled cotton gauze media, this filter captures harmful contaminants before they enter the intake.

Designed with a flexible, ultra-strong molded rubber flange, the filter absorbs engine vibrations and secures tightly to intake pipes. The pliable rubber flange can also stretch up to 1/16th of an inch (1.5mm) to accommodate tight fits or minor dimensional variances. Because it is washable and reusable, this filter provides a long-lasting, cost-effective replacement for disposable paper filters.

Best Uses

1. Custom Engine Builds & Air Intakes: Fits custom-fabricated intake tubing requiring a 2.25-inch inner flange diameter.
2. Racing & Performance Vehicles: Provides high airflow for go-karts, mini bikes, track cars, and custom racing rigs.
3. Powersports Equipment: Fits snowmobiles, ATVs, and motorcycles with tight engine bay clearances.
4. Small Machinery & Industrial Generators: Protects small gas engines, tractors, and portable power units.
5. Radio-Controlled (RC) Gas Cars: Serves as a heavy-duty, high-flow air filter for scaled combustion-powered RC vehicles.

Features

1. High-Flow Oiled Cotton Media: Engineered with layered cotton gauze to maximize airflow without compromising engine protection.
2. Pliable Rubber Flange: Ultra-strong molded rubber base absorbs engine vibration and provides a secure seal.
3. 1/16-Inch Flange Stretch: Flexible design allows the flange to stretch up to 1.5mm for custom or in-between pipe sizes.
4. Compact Dimensions: Low-profile 2-inch height and 3.5-inch outer diameter make it ideal for tight-clearance engine bays.
5. Clamp-On Design: Includes a heavy-duty worm-gear hose clamp for simple, tool-friendly installation.

Benefits

1. Increased Power & Acceleration: Improves throttle response and horsepower by reducing intake airflow restriction.
2. Washable & Reusable: Designed to be cleaned and re-oiled, eliminating the need to purchase disposable replacement filters.
3. Cost-Effective Long-Term Choice: Built to last for the life of your equipment, lowering overall maintenance expenses.
4. Vibration Resistance: Pliable rubber structure prevents fatigue cracks and keeps the filter firmly attached during rough operation.
5. Versatile Fitment: Universal dimensions allow it to be adapted across a wide variety of automotive, power equipment, and custom projects.