K&N RU-4650 Universal Clamp-On High-Flow Air Filter

Vehicle Fitment

• Universal - clamp-on filter for custom or aftermarket intakes (intake tube ID ≈ 3")

Fitment Notes

• Not designed as a direct OEM airbox replacement
• Verify inlet tube diameter (≈ 3 in / 76 mm) and clearance before installation

Features

• High-flow cotton gauze filter media for increased airflow and engine breathing
• Four-layer media offers enhanced filtration and contaminant trapping
• Washable and reusable - designed for long service life
• Pre-oiled, ready to install out of the box
• Flexible molded rubber flange for secure clamp-on fit and vibration absorption
• Round-tapered shape - suitable for many custom intake configurations
• Low-restriction design helps improve throttle response and performance
• Durable construction to handle street, off-road, or performance use

Specifications

• Flange Inside Diameter: 3.0 in (76 mm)
• Base Outside Diameter: 5.0 in (127 mm)
• Top Outside Diameter: 4.0 in (102 mm)
• Filter Height: 6.0 in (152 mm)
• Filter Shape: Round Tapered
• Filter Media: Oiled cotton gauze
• Reusable: Yes, washable & re-oiled
• Filter Re-oiling Amount: 0.95 oz (28 ml)
• Package Contents: 1x air filter

Included Components

• 1x K&N RU-4650 Universal Clamp-On Air Filter (pre-oiled, ready to install)

Product Description

The RU-4650 Universal Clamp-On Air Filter from K&N is designed to work with custom or aftermarket intake setups that accept a 3-inch intake tube. Its round-tapered shape and flexible rubber flange allow secure clamp-on installation even when intake geometry is non-standard or offset. The multi-layer cotton gauze media enhances airflow and provides robust filtration, helping engines breathe more freely while protecting against contaminants.

Because the filter is washable and reusable, the RU-4650 offers long-term value compared to disposable filters. It ships pre-oiled and ready to install - making it a convenient performance upgrade for street, off-road, or racing applications. Ideal for builders, tuners, or vehicle owners using modified intakes who want a reliable, high-flow, reusable air filter solution.