K&N RU-4450 Round Tapered Universal Clamp-On Air Filter, 2-3/4in Flange

Vehicle Fitment

• Universal - not vehicle-specific; designed for a wide range of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, and tractors

Fitment Notes

• Clamp-on design fits carburetor or intake necks matching the 2.75 in. flange diameter; rubber flange can stretch up to 1/16 in. to accommodate in-between sizes
• Not a direct factory drop-in for any specific make or model - match your carburetor throat OD to the filter's ID before ordering

Features

• Four layers of premium cotton gauze treated with a specially designed tacking agent
• Intricate filter media mesh designed to block and trap harmful contaminants
• Round tapered cone design with a wide 5.875 in. base for strong airflow capacity
• Ultra-strong molded pliable rubber flange absorbs vibration for a secure attachment
• Flange can stretch up to 1/16 in. (1.5mm) to fit in-between sizes
• Washable and reusable, rated for approximately 75,000 miles between cleanings
• Designed to increase horsepower and acceleration through improved airflow
• Pre-oiled and ready for easy installation

Specifications

• Shape: Round Tapered (Conical)
• Filter Material: Cotton gauze
• Flange (Inside) Diameter: 2.75 in.
• Base Outside Diameter: 5.875 in.
• Top Diameter: 4.75 in.
• Height: 5 in.
• Flange Length: 0.75 in.
• Flange Type: Centered, 0-degree angle
• Top Style: Rubber
• Fitment Type: Universal clamp-on

Included Components

• 1x K&N RU-4450 Round Tapered Universal Air Filter

Product Description

The K&N RU-4450 is a round tapered universal air filter designed to mount directly onto a carburetor throat or intake neck rather than a single vehicle's factory air box. With a 2.75 in. flange and a generously sized 5.875 in. base, it's built to maximize filtration surface area for strong, consistent airflow on custom carbureted and performance intake setups.

Built from four layers of cotton gauze treated with K&N's tacking agent, the RU-4450 is engineered to trap contaminants while supporting high airflow for a boost in horsepower and acceleration. The pliable rubber flange absorbs vibration for a secure hold and can stretch slightly to accommodate intake necks that fall between standard sizes.

This filter is a good fit for builders and enthusiasts working on carbureted engines or custom intake setups who want a wide-base conical filter for maximum airflow within a compact 5 in. height. Since it's a clamp-on universal filter, match your carburetor throat's outside diameter to the filter's 2.75 in. inside diameter before ordering, and wash and re-oil it with K&N's cleaning kit when it gets dirty to maintain peak filtration performance.