K&N RF-1031 Universal High-Flow Clamp-On Air Filter

Vehicle Fitment

• Universal application - suitable for a wide range of vehicles, performance builds, off-road rigs, generators and specialty equipment. Dimensions must be verified before installation.

Features

• High-flow washable and reusable cotton-gauze performance filter media
• Layered oiled cotton-gauze construction for enhanced airflow and effective filtration
• Improves engine breathing and throttle response by reducing intake restriction
• Clamp-on drop-in design supports custom or universal intake systems - no vehicle-specific housing required
• Molded pliable rubber flange absorbs vibration and allows secure attachment to intake tubing
• Durable construction engineered for long-term use under normal conditions
• Eco-friendly reusable design helps reduce waste compared to disposable filters
• Backed by K&N's warranty for universal filter use

Specifications

• Flange Inside Diameter: 3.50 in (89 mm)
• Base Outside Diameter: 5.75 in (146 mm)
• Top Outside Diameter: 3.75 in (95 mm)
• Height: 6.00 in (152 mm)
• Flange Length: 1.75 in (44 mm)
• Filter Media: Multi-layer cotton gauze, oiled
• Shape: Round tapered clamp-on style
• Weight: approx. 1.1 lb (0.5 kg)
• Filter Re-Oiling Amount: ~1.06 oz (31 ml)

Included Components

• 1x K&N RF-1031 Universal High-Flow Clamp-On Air Filter (pre-oiled)

Product Description

The K&N RF-1031 is a universal high-flow clamp-on air filter engineered for custom intake systems, performance vehicles, off-road rigs, generators and other applications where a vehicle-specific filter may not suffice. Its 3.5 inch flange inside diameter and 6 inch height make it versatile for many installations while still providing superior airflow thanks to its oiled cotton-gauze media.

Installation is straightforward: simply clamp the RF-1031 onto the intake tubing or adapter matching the flange size. Because it's reusable and washable, it offers long-term value and reduces the need for recurring filter replacements. The pliable rubber flange helps absorb vibration and ensures a secure fit in different setups.

Ideal for custom builders, performance enthusiasts and non-standard equipment installations, the RF-1031 delivers flexibility, performance and durability. Always verify your intake flange diameter, installation height and clearance before final install to ensure proper fit and function.