K&N High-Flow Universal Clamp-On Air Filter RG-1001RD — 4" Flange, 5.5" Height, Reusable High-Performance

Built for enthusiasts and technicians who need a versatile intake solution, this K&N clamp-on filter combines multilayer cotton-gauze media and a pliable molded rubber flange to offer improved airflow, secure mounting, and long service life. Its tapered round shape and compact dimensions — 4-inch flange diameter, 5.5-inch filter height, and a 1.125-inch flange length — make it suitable for a wide range of aftermarket and custom air intake setups.

How will this filter affect engine airflow and performance?

The RG-1001RD is engineered to promote higher airflow through multiple layers of specially treated cotton-gauze media, which can help throttle response and acceleration in many applications. It’s pre-oiled from the factory to maximize filtration efficiency while allowing increased air volume compared with typical disposable paper elements.

• Multi-layer cotton gauze media increases air throughput
• Pre-oiled for immediate installation and optimal sealing
• Tapered round shape helps smooth intake flow in confined spaces

Is the clamp-on filter easy to fit and secure?

The clamp-on design features an ultra-strong, molded pliable rubber flange that absorbs vibration and creates a tight seal around 4-inch intake tubes. Installation is straightforward: slide the flange over the intake, position the clamp, and tighten — no permanent modification required.

• 4-inch flange diameter designed for common intake tubing
• Pliable rubber flange reduces vibration and improves sealing
• Quick clamp fitment suits many custom and universal applications

How long does this filter last and what maintenance does it need?

K&N filters are intended to be washable and reusable, offering lifetime service when cleaned properly. Under normal highway driving, the recommended cleaning interval is about every 75,000 miles, though dusty or off-road conditions will require more frequent attention.

• Washable and reusable design reduces replacement frequency
• Typical cleaning interval: up to 75,000 miles in light conditions
• Follow K&N cleaning and re-oiling procedures for best results

What materials and protection does the filter use?

The RG-1001RD uses a layered cotton-gauze matrix treated with a tack-enhancing agent to trap contaminants while allowing airflow. Combined with durable construction and premium rubber components, the filter is built to withstand vibration and repeated cleaning cycles.

• Multiple cotton-gauze layers for filtration and airflow balance
• Treated media improves contaminant capture without heavy restriction
• Durable molded rubber flange and reinforced construction for longevity

Who is this for: drivers, mechanics, and custom builders who want a simple, effective way to upgrade intake airflow without modifying the vehicle permanently. The RG-1001RD suits hobbyists fitting aftermarket intakes, racers needing reliable, reusable filtration, and anyone preferring a low-waste alternative to disposable filters. If you need a compact, clamp-on solution with a 4" flange, 5.5" height, and tapered round profile, this K&N unit delivers proven materials and straightforward installation for many universal applications.

Quick specs: flange diameter 4 in, filter height 5.5 in, flange length 1.125 in, shape round tapered, model RG-1001RD. Includes a 1-year limited warranty and the option to clean and reuse rather than replace.