K&N Universal Clamp-On Air Filter 6-inch Flange Tapered Cone — Washable, Pre-Oiled

The K&N High-Flow Original Universal Clamp-On Air Filter (RU-5173) is a washable, reusable 6" flange, tapered clamp-on filter engineered to increase airflow and last for the life of your vehicle.

Designed for a broad range of performance and replacement applications, this K&N universal clamp-on filter pairs multi-layer cotton gauze media with a pliable rubber flange to deliver improved airflow without disposable replacements. Its tapered, cone-style shape and 6-inch height make it a versatile choice for custom intake builds, aftermarket throttle bodies, and many OEM housings. Pre-oiled and made in the USA, the RU-5173 targets drivers who want measurable airflow gains, long-term savings, and reduced landfill waste from disposable filters.

How does this filter improve engine breathing and performance?

The RU-5173 uses four layers of premium cotton gauze treated with a tackifying agent to create a dense but breathable filtration matrix. This configuration lets more air pass through while still trapping contaminants, which can help throttle response and acceleration in many setups. Note: results vary by vehicle and other intake modifications.

• Multi-layer cotton gauze increases volumetric airflow compared to many paper elements
• Specialized tacking agent helps particulate adhere to the media instead of passing through
• Tapered cone shape optimizes flow into narrow throttle bodies or custom intakes
• Pre-oiled for immediate, out-of-the-box performance

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

Installation is straightforward: slide the pliable rubber flange onto the intake tube or velocity stack and secure with a hose clamp. Because the flange is molded for flexibility, it absorbs vibration and creates a dependable seal across uneven tubes. Maintenance consists of cleaning and re-oiling on a long interval, not frequent replacement.

• Slip flange onto tube and tighten clamp — no special tools required
• Clean only as needed (K&N recommends up to 75,000 miles under normal highway conditions)
• Use K&N cleaner and oil for best results and to preserve filtration efficiency
• Reusable design eliminates repeated purchases and cut-downs in parts changes

What are the materials, specifications, and warranty details?

The RU-5173 features a molded pliable rubber flange, four-layer cotton gauze media, and durable construction intended to last. Key dimensions are a 6-inch flange diameter, 6-inch overall height, and 0.625-inch flange length. The product ships pre-oiled and carries a one-year limited warranty from K&N.

• Flange diameter: 6 in; Filter height: 6 in; Flange length: 0.625 in
• Round tapered (cone-style) shape for versatile fitment across many applications
• Made in USA with rugged materials for long service life
• 1-Year limited warranty and recommended K&N cleaning products for maintenance

Who is this for? The K&N RU-5173 is aimed at DIY mechanics, custom intake builders, and performance-minded drivers who want a durable, oil-prepared clamp-on filter that improves airflow without recurring disposable-filter costs. It’s well suited to people replacing restrictive paper elements, assembling aftermarket intakes, or those seeking a reusable solution that reduces waste. If you need a straightforward, reliable clamp-on filter with established brand support and long service intervals, this K&N high-flow unit is a practical choice.