K&N High-Flow Clamp-On Air Filter RG-1001BL — 4 in Flange, Washable & Reusable Cone

The K&N High-Flow Original Lifetime Universal Clamp-On Air Filter (RG-1001BL) is a washable, reusable cone-style intake filter engineered to increase airflow and provide long-lasting filtration for many vehicle and equipment applications.

This tapered clamp-on filter combines a durable, pliable rubber flange with K&N’s multi-layer cotton gauze media to offer higher airflow than standard disposable paper filters while reducing waste and long-term replacement costs. With a 4-inch flange diameter, 5.5-inch filter height and 1.125-inch flange length, this round tapered design suits a wide range of custom and universal installations where a clamp-on intake is required.

How does this filter affect performance?

By using layered, oiled cotton gauze, the filter allows more air to reach the engine compared with many stock paper elements, which can support stronger throttle response and potential horsepower gains under compatible conditions. It’s a common upgrade for enthusiasts looking for improved breathing without complex modifications.

• State-of-the-art media designed to increase airflow and acceleration.
• Multi-layer cotton gauze to trap contaminants while permitting higher flow.
• Pre-oiled at manufacture for immediate installation and performance.

How often will I need to clean this K&N filter?

The RG-1001BL is engineered for extended service intervals; under normal highway driving it typically only needs cleaning about once every 75,000 miles (roughly five years for average annual mileage). Cleaning frequency depends on driving conditions—dustier environments will require earlier maintenance.

• Recommended cleaning interval: approximately every 75,000 miles in normal conditions.
• Shorten interval for off-road, dusty, or heavy-stop driving conditions.
• Reusable design reduces recurring filter purchases and landfill waste.

What makes the clamp-on design and materials practical?

The unit’s molded pliable rubber flange cushions vibration and provides a secure sealing surface for hose clamps, making it adaptable to a variety of intake pipes and setups. Rugged construction and quality materials are intended to withstand repeated cleanings and long-term use.

• 4-inch flange diameter with 1.125-inch flange length for reliable clamping.
• Flexible rubber flange absorbs vibration and creates a tight seal.
• Durable assembly built to last a vehicle’s lifetime with proper care.

Can I install this filter myself and on what applications will it fit?

Yes—K&N clamp-on filters are pre-oiled and ready for drop-in fitting, making them one of the simplest performance upgrades. The universal tapered shape and common flange size make the RG-1001BL suitable for aftermarket intakes, airboxes, small engines, and custom projects where a clamp-on filter is needed.

• Pre-oiled and ready to install—no additional prepping required.
• Universal fitment for many cone-style and clamp-on applications.
• Available in multiple shapes and sizes across K&N’s clamp-on range for varied needs.

Who is this for: The K&N RG-1001BL is aimed at car and motorcycle enthusiasts, DIY mechanics, and anyone building or modifying intake systems who wants a durable, reusable filter that balances improved airflow with long service life. It’s also a practical choice for users who prefer fewer consumables and reduced landfill waste from disposable filters. If you need a 4-inch clamp-on solution with a 5.5-inch tapered profile and reliable, washable filtration, this K&N unit is designed to meet those needs.