K&N High-Flow Universal Clamp-On Air Filter RU-5173 — 6in Flange, 6in Height, Washable Reusable

This RU-5173 clamp-on air filter from K&N is a universal, tapered (cone-style) high-flow intake filter designed to replace disposable filters and support improved engine breathing. With a 6-inch flange diameter, 6-inch filter height and a 0.625-inch flange length, it fits a wide range of installations where a clamp-on connection is needed. Constructed with multiple layers of cotton gauze media, a resilient rubber flange, and pre-applied oil, this filter focuses on repeatable airflow gains, durable service life, and reduced waste compared with single-use paper elements.

How does this filter affect engine performance?

The RU-5173 is built to increase airflow into the intake system while still trapping contaminants. Improved airflow can support quicker throttle response and help an engine run closer to its designed power band without sacrificing filtration efficiency.

• State-of-the-art cotton gauze media tuned for airflow and particle capture
• Multi-layer construction balances protection with minimal flow restriction
• Pre-oiled media to optimize initial sealing and filtration performance

How do I install and maintain a clamp-on K&N Universal filter?

Installation is straightforward: slip the rubber flange over the intake pipe and secure with a hose clamp. Maintenance is low-frequency and user-serviceable — remove, clean, re-oil, and reinstall when needed rather than replacing the whole element.

• Flange slips over a 6-inch intake pipe; use standard clamps for secure attachment
• Pre-oiled out of the box; follow K&N cleaning kit instructions for servicing
• Typical cleaning interval: about every 75,000 miles under normal highway driving

What are the construction and durability features I should know?

This filter combines robust materials and precision molding to withstand vibration and repeated servicing. The pliable rubber flange absorbs movement and forms a reliable seal, while the cotton gauze media is supported by a protective mesh to maintain shape and filtration performance over time.

• Durable molded rubber flange resists cracking and helps dampen vibration
• Four layers of cotton gauze with a tack-treated finish for contaminant capture
• Made in the USA with a 1-year limited warranty for peace of mind

Will this filter fit my vehicle or application?

RU-5173 is a universal clamp-on design intended for many custom and OEM-style setups where a 6" flange works. Because it’s a tapered cone shape, it is most suitable for open-air intakes, custom cold-air setups, and many aftermarket intake pipes. Always verify flange diameter and available space before purchase.

• Flange diameter: 6.00 inches; filter height: 6.00 inches; flange length: 0.625 inches
• Fits round tapered (cone) intake openings and many custom applications
• Ideal for performance upgrades, custom intakes, and replacement of disposable elements

Who is this for? The K&N RU-5173 suits enthusiasts, mechanics, and DIY builders who want a reusable clamp-on cone filter that improves airflow and reduces recurring filter purchases. It’s a good choice for people installing aftermarket intake pipes, restoring or modifying vehicles, or anyone seeking a durable, serviceable air filter that reduces landfill waste without sacrificing performance.