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

The K&N RG-1001BL is a universal, clamp-on high-flow air filter with a 4-inch flange and 5.5-inch height engineered to be washable, reusable, and built to last the life of your vehicle.

This compact cone-shaped filter is part of K&N’s Original Lifetime line of clamp-on air filters, designed to increase airflow while providing multi-layer protection for engines across many applications. Made with premium cotton gauze media, a pliable rubber flange and rugged construction, the RG-1001BL suits small-intake setups, custom installations, and replacements where a 4-inch flange and tapered, cone profile are required. It ships pre-oiled and ready to install for a fast performance upgrade without recurring disposable-filter costs.

How does this filter affect engine performance?

The RG-1001BL improves airflow into the intake by using layered cotton gauze media that balances filtration and flow. Increased airflow can support smoother throttle response and potentially better acceleration when matched with the rest of the intake system.

• State-of-the-art filter media increases airflow while trapping contaminants.
• Four-layer construction provides staged particle capture to protect the engine.
• Pre-oiled design maintains filtration efficiency right out of the box.

How often do I need to clean and maintain it?

This K&N clamp-on filter is reusable and requires far less frequent service than disposable paper elements under normal driving. Typical highway driving conditions call for cleaning approximately every 75,000 miles (roughly every five years at 15,000 miles per year), though dusty or off-road use requires earlier attention.

• Inspect visually during regular vehicle checks for heavy debris or oil buildup.
• Clean with K&N cleaning products or equivalent when dirt reduces airflow.
• Re-oil carefully after cleaning to maintain filtration characteristics.

Will it fit my vehicle and how easy is installation?

The RG-1001BL is a universal clamp-on style filter with a 4-inch flange and 1.125-inch flange length, designed for applications needing a round tapered (cone) filter. Its pliable molded rubber flange absorbs vibration and makes a secure, adaptable seal for many aftermarket or custom intake setups.

• 4-inch flange diameter fits many aftermarket intake tubes and adapters.
• Pliable rubber flange eases mounting and reduces vibration transfer.
• Pre-oiled and ready to install—typically clamps on with a standard hose clamp.

What are the construction and warranty details?

The filter uses multiple layers of premium cotton gauze treated with a tackifying agent to trap contaminants while letting air flow freely. Built to be durable, it is made with high-quality materials meant to outlast disposable filters; K&N backs the product with a 1-year limited warranty.

• Durable molded rubber flange and reinforced filter media for longevity.
• Designed for lifetime use with proper cleaning and care.
• 1-year limited warranty for manufacturing defects.

Who is this for: The K&N RG-1001BL is ideal for car, truck, motorcycle, ATV, or custom-intake owners who need a compact, cone-style clamp-on filter with a 4-inch flange. Choose this filter if you want a washable, reusable solution that reduces waste and maintenance frequency, fits many aftermarket intake setups, and offers a straightforward, bolt-on performance upgrade without replacing factory airboxes.