K&N RA-0520 Engine Air Filter

K&N RA-0520 Universal Air Filter

The K&N RA-0520 is a round, straight universal clamp-on air filter built for a wide range of intake setups. Its 2.063-inch centered flange, 6-inch height, and 3.5-inch outside diameter make it a practical choice for custom intake routing, including performance builds and equipment applications that need a washable, reusable filter element.

Key Features

• Cotton gauze filter media for high-performance air filtration
• Round straight universal air filter design
• Centered 2.063-inch flange with 0-degree angle
• Flexible molded rubber flange helps absorb vibration and secure attachment
• Pre-oiled filter element, ready for service
• Washable and reusable construction
• 6-inch height and 3.5-inch outside diameter
• Part number RA-0520

Detailed Description

Built for universal intake applications, the K&N RA-0520 uses cotton gauze media and a flexible rubber top and flange to create a secure clamp-on fit on properly sized inlets. The centered flange measures 2.063 inches inside diameter and 0.875 inches long, and the pliable rubber design can stretch slightly to help bridge small size differences. This makes the RA-0520 a strong option for custom air intake assemblies, racing vehicles, generators, snowmobiles, tractors, and other equipment that uses a round straight filter. If you are searching for a K&N RA-0520 air filter for a custom build, or a K&N RA-0520 replacement filter for a universal intake setup, this part delivers a serviceable, reusable design. It is also a practical choice for vehicle and equipment owners looking for a washable clamp-on filter for Honda Civic, Ford Mustang, or other make/model projects where the intake diameter matches the flange size.

Common Uses

• Replacing a worn or damaged universal clamp-on air filter
• Restoring airflow on a custom intake with a 2.063-inch inlet
• Addressing restricted airflow caused by a dirty disposable filter
• Reducing replacement frequency with a washable, reusable filter
• Supporting performance builds that use a round straight universal filter

Installation Notes and Tips

Verify the intake tube or throttle-body inlet diameter before ordering. The RA-0520 uses a centered flange and clamp-on style mounting, so the inlet size must match the 2.063-inch inside diameter for proper sealing. Clean and re-oil the filter according to K&N service procedures after washing, and inspect the rubber flange during installation to ensure a secure, vibration-resistant fit. For vehicle-specific searches such as Honda Civic air filter, Ford Mustang intake filter, or universal performance air filter, confirm dimensions rather than relying on model name alone.

Quality Assurance

K&N manufactures the RA-0520 as a washable, reusable filter with a 1-year limited warranty. The filter is pre-oiled and packaged as one air filter in a box for straightforward replacement or custom-build use. Part number RA-0520 is the identifier to reference when matching this universal air filter to your intake setup.