K&N RU-2590 Universal Clamp-On Round Tapered Air Filter 4in Flange 5.375in OD

Vehicle Fitment

• Universal Fit - Designed for performance vehicles, ATVs, cold air intake systems, racing builds, and any application with a 4.00 in. intake tube requiring a clamp-on tapered air filter
• Also used as a replacement filter for ModQuad Airflow Systems requiring a 4.00 in. flange clamp-on filter

Fitment Notes

• This is a universal clamp-on filter - verify your intake tube outside diameter matches the flange inside diameter of 4.00 in. before purchasing
• Rubber flange can be stretched up to 1/16 in. (1.5 mm) to accommodate in-between sizes or angled intake configurations
• Not a direct OEM replacement for a specific vehicle - confirm fitment by measuring your intake tube diameter

Features

• Multi-layer oiled cotton gauze media delivers up to 50% more airflow than standard paper filters
• Round tapered (cone) design maximizes filter surface area for high-CFM airflow performance
• Ultra-strong molded pliable rubber flange absorbs vibration and provides a secure, leak-free attachment
• Washable and reusable - engineered to last the lifetime of your build or vehicle
• Pre-oiled and ready to install straight out of the box
• Rubber top end cap for a clean, secure finish
• Made in the USA
• Backed by K&N's 10-Year/Million Mile Limited Warranty

Specifications

• Shape: Round Tapered (Cone)
• Flange Inside Diameter: 4.00 in. (102 mm)
• Flange Length: 0.625 in. (16 mm)
• Flange Type: Centered (Single)
• Base Outside Diameter: 5.375 in. (137 mm)
• Top Outside Diameter: 4.50 in. (114 mm)
• Height: 7.00 in. (178 mm)
• Filter Material: Multi-layer oiled cotton gauze
• Filter Re-Oiling Amount: 1.24 oz (37 ml)
• Filter Color: Red
• Top Style: Rubber End Cap
• Inner Wire: No

Included Components

• 1x K&N RU-2590 Universal Clamp-On Round Tapered Air Filter

Product Description

The K&N RU-2590 is a high-flow universal clamp-on round tapered air filter built for performance cold air intakes, ATVs, racing builds, ModQuad Airflow Systems, and any application requiring a 4-inch flange with a 7-inch height. Its tapered cone profile - 5.375 inches at the base narrowing to 4.50 inches at the top - delivers substantial cotton gauze surface area to support demanding intake flows while maintaining excellent contaminant filtration. The multi-layer oiled construction flows significantly more air than any paper element, translating to sharper throttle response and measurable horsepower gains.

The centered 4.00 in. rubber flange mounts securely onto matching intake tubes, absorbs vibration, and can be stretched slightly to fit in-between sizes or angled configurations. Washable and reusable, the RU-2590 arrives pre-oiled and is ready to install out of the box. It is backed by K&N's 10-Year/Million Mile Limited Warranty and made in the USA - making it a reliable, long-term upgrade for any performance or racing application requiring a round tapered filter with a 4-inch inlet.