K&N Universal Clamp-On Air Filter 4in FLG / 6-1/2in B / 4-1/2in T / 8in H

K&N Universal Clamp-On Air Filter 4in FLG | 6.5in B

Boost horsepower and engine protection with the K&N Universal Clamp-On Air Filter (4" Flange, 6.5" Base, 4.5" Top, 8" Height). Washable, reusable, and easy to install.

The K&N Universal Clamp-On Air Filter is engineered to deliver increased airflow and exceptional filtration for a wide variety of custom and performance applications. Designed with a round tapered conical profile, this filter features a 4-inch flange inside diameter, a 6.5-inch base outside diameter, a 4.5-inch top diameter, and an overall height of 8 inches.

Constructed with multiple layers of premium oiled cotton gauze media, this high-flow filter allows your engine to breathe more freely while trapping harmful dust, dirt, and contaminants. It comes molded with ultra-strong, pliable rubber flanges that absorb engine vibration, ensure a leak-free seal, and stretch up to 1/16" (1.5mm) to fit micro-variations in intake tube sizing. Pre-oiled straight out of the factory, this filter is a simple clamp-on upgrade built for long-lasting performance—just wash, re-oil, and reinstall whenever it reaches its service interval.

Best Uses

1. Custom Cold Air Intakes: Ideal for custom automotive builds, engine swaps, or aftermarket intake piping with a 4-inch outer diameter.
2. Motorsports & Racing: Provides maximum airflow for race cars, drag cars, track vehicles, and off-road builds.
3. Performance Upgrades: Upgrade stock air boxes on tuned gasoline and diesel trucks, SUVs, and sports cars.
4. Industrial & Specialty Equipment: Excellent for power generators, snowmobiles, tractors, and custom power equipment requiring 4-inch intake flanges.

Features

1. Precision Tapered Dimensions: Features a 4" flange ID, 6.5" base OD, 4.5" top OD, and an 8" filter height for high surface area in compact spaces.
2. High-Flow Oiled Cotton Media: Multi-layered cotton gauze designed to boost airflow while offering world-class filtration protection.
3. Pliable Molded Rubber Flange: Vibration-absorbing flexible flange secures tightly with the included clamp and stretches up to 1/16" for precise fitment.
4. Washable & Reusable: Eco-friendly design allows the filter to be cleaned and re-oiled for thousands of miles of continued use.
5. Pre-Oiled Clamp-On Design: Factory-oiled and ready to install immediately out of the box with standard hand tools.

Benefits

1. Increased Horsepower & Acceleration: Reduces intake restriction, allowing your engine to pull in more oxygen for noticeable performance gains.
2. Cost-Effective Long-Term Savings: Eliminates the need to repeatedly buy disposable paper filters over the lifespan of your vehicle.
3. Superior Engine Protection: Advanced filtration media traps dirt and debris to safeguard vital internal engine components under harsh conditions.
4. Hassle-Free Maintenance: Long service intervals mean you only need to clean it up to every 50,000 miles under normal highway driving conditions.
5. Versatile Compatibility: Clamp-on universal design allows seamless mounting across custom automotive, marine, racing, and industrial applications.

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