K&N Universal Tapered Filter 2.5in Flange ID x 4.5in Base OD x 3.5in Top OD x 5in Height

K&N Universal Tapered Air Filter 2.5in Flange – 5in Height

Boost engine airflow with the K&N Universal Tapered Air Filter (RU-9630). Features a 2.5in flange, 4.5in base, 3.5in top, and 5in height. Washable and reusable!

The K&N Universal Tapered Air Filter (Part Number RU-9630) is engineered to maximize airflow, horsepower, and overall acceleration across a wide variety of custom and performance applications. Featuring a 2.5-inch inner flange diameter, a 4.5-inch base diameter, a 3.5-inch top diameter, and a 5-inch body height, this compact cone filter fits tightly into custom intake setups where space is limited.

Constructed with premium oiled cotton gauze filter media sandwiched between protective wire mesh, this filter captures fine dust and debris while maintaining low airflow restriction. The flange is molded from durable, pliable rubber that dampens engine vibration and stretches slightly to provide a tight, leak-free seal on 2.5-inch intake piping. Because it is washable and reusable, it offers a cost-effective, long-term replacement over disposable paper filters.

Best Uses

1. Custom Cold Air & Short Ram Intakes: Fits custom performance intake tubes with a 2.5-inch outer diameter.
2. Compact Passenger Cars: Ideal for small-engine vehicle intake upgrades, such as the Honda Fit and Ford Fiesta.
3. Motorsports & Racing Vehicles: Suitable for custom track, drift, or drag racing setups needing high-flow filtration in tight spaces.
4. Powersports & Utility Equipment: Great for snowmobiles, ATVs, tractors, and custom buggy builds.
5. Generators & Industrial Engines: Works well for small utility engines requiring improved intake airflow and reusable air filters.

Features

1. High-Flow Cotton Gauze Media: Oiled multi-layer cotton construction designed to allow significantly higher airflow than standard paper filters.
2. Pliable Molded Rubber Flange: Ultra-strong rubber flange absorbs vibration and can stretch up to 1/16 inch for a precise, secure fit.
3. Pre-Oiled and Ready to Install: Ships pre-oiled from the factory, making installation fast and straightforward.
4. Compact Tapered Cone Design: 2.5in Flange ID x 4.5in Base OD x 3.5in Top OD x 5in Height fits easily into tight engine compartments.
5. Clamp-On Design: Includes a heavy-duty hose clamp for easy attachment and removal.

Benefits

1. Increases Power & Acceleration: Improves overall engine performance by providing reduced intake restriction and increased air delivery.
2. Washable & Reusable: Can be cleaned and re-oiled repeatedly using a K&N cleaning kit, saving money over the life of your equipment.
3. Superior Engine Protection: Multi-layer tack-treated cotton mesh traps dust and contaminants before they reach your engine.
4. Eco-Friendly Choice: Replaces single-use paper air filters, keeping disposable filter waste out of landfills.
5. Universal Versatility: Flexible mounting flange and adaptable shape allow fitment across automotive, racing, and powersports applications.  

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