K&N RU-3600 Universal Clamp-On Round Tapered Air Filter 4in Flange 5.375in OD

Vehicle Fitment

• Universal Fit - Designed for performance vehicles, cold air intake systems, racing builds, and any application with a 4.00 in. intake tube requiring a compact low-profile clamp-on tapered air 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
• Compact round tapered (cone) design - 5-inch height suits tight vertical clearance engine bay locations
• 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: 5.00 in. (127 mm)
• Filter Material: Multi-layer oiled cotton gauze
• Filter Color: Red
• Top Style: Rubber End Cap
• Inner Wire: No

Included Components

• 1x K&N RU-3600 Universal Clamp-On Round Tapered Air Filter

Product Description

The K&N RU-3600 is a high-flow universal clamp-on round tapered air filter built for performance cold air intakes, racing builds, and high-CFM applications requiring a 4-inch flange in a compact 5-inch tall package. Its tapered cone profile - 5.375 inches at the base narrowing to 4.50 inches at the top - delivers solid cotton gauze surface area to support demanding 4-inch intake flows while maintaining excellent contaminant filtration. The compact height makes it ideal for engine bays with limited vertical clearance above the intake. 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. Washable and reusable, the RU-3600 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 application requiring a compact clamp-on filter with a 4-inch inlet.