K&N High-Flow Clamp-On Universal Air Filter RU-3580 — 3" Flange, 5" Height, Washable Performance

The K&N High-Flow Original Lifetime Universal Clamp-On Air Filter (RU-3580) is a washable, reusable cone-style filter engineered to increase airflow and provide long-term filtration for a wide range of engines.

This clamp-on air filter pairs K&N’s multi-layer cotton gauze media with a pliable molded rubber flange, delivering improved airflow, durable fitment, and a reusable design that replaces disposable paper filters. With a 3-inch flange diameter, 1.75-inch flange length and a 5-inch filter height, the RU-3580 is a tapered round filter suited for many intake applications where space and secure connection matter.

How does this filter improve performance without frequent replacements?

The RU-3580 uses four layers of premium cotton gauze treated with a tackifying agent to trap contaminants while allowing greater air volume than typical paper elements. Increased airflow can help engines breathe more easily, supporting stronger throttle response and potential gains in horsepower and acceleration.

• Multi-layer cotton gauze for effective filtration with high airflow
• Pre-oiled and ready to install—no break-in required
• Washable and reusable for the life of the vehicle, reducing replacement frequency
• Designed to balance filtration efficiency and airflow for performance applications

What are the physical dimensions and fitment features I should know?

Physically the RU-3580 is a tapered (cone) round filter with a 3-inch flange inside diameter, 1.75-inch flange length and a 5-inch overall height—dimensions that suit many universal clamp-on installations. The flange is molded from pliable rubber to absorb vibration and create a secure seal when used with a hose clamp or intake pipe.

• 3.00 in flange diameter for common intake tubes and adapters
• 1.75 in flange length to accommodate clamping and angled connections
• 5.00 in filter height for compact engine bays or custom setups
• Round tapered shape fits cone-style and many custom airbox designs

How do I care for and maintain this reusable air filter?

Unlike disposable filters, the K&N RU-3580 is designed to be cleaned and re-oiled, extending service life and cutting long-term costs. Under normal highway driving, K&N recommends cleaning approximately every 75,000 miles, though severe or dusty conditions may require more frequent attention.

• Pre-oiled from the factory—install right away
• Clean using K&N cleaner and re-oil kit following manufacturer instructions
• Typical highway interval: clean every 75,000 miles; adjust for harsh environments
• Reusable design reduces recurring filter purchases and landfill waste

Is this filter durable and backed by warranty?

The RU-3580 is built with rugged materials—premium cotton media, protective oil treatment, and a robust molded rubber flange—intended for long-term use. It comes with a 1-year limited warranty and is made in the USA, reflecting K&N’s production standards and quality control.

• Durable construction for lifetime use when properly maintained
• 1-Year limited warranty for manufacturing coverage
• Made in the USA to K&N quality specifications
• Reduces landfill waste by replacing disposable filters

Who is this for: The K&N RU-3580 clamp-on air filter is aimed at car, truck, motorcycle, and powersports owners who want a versatile, performance-minded replacement for disposable filters—especially those doing custom intake work or seeking durable, reusable filtration. It’s a practical upgrade for DIY mechanics, performance enthusiasts, and anyone looking to lower long-term maintenance costs while keeping solid airflow and protection for their engine.