K&N Custom Air Filter - Round 4-5/8in ID x 6in - E-3971

K&N off-road replacement air filters are ideal for extended use in dirty and dusty off-road riding and provide clean carburetion even at high altitude. Generally, no jet changes are required with just a K&N filter element. K&N replacement air filters are washable and reusable and provide high air-flow with excellent filtration.Air filters are essential when it comes to your vehicles performance and protection. Shop from our list of air filters from brands like K&N, AEM, Injen, Spectre, Air Raid, aFe, and many more!It is recommended that you replace the air filter in your car every 12,000 to 15,000 miles. Keep your car running strong with a new, direct fit air filter.For over 50 years, K&N has been an industry-leader in automotive filtration and technology—offering products to increase performance, protection, and longevity in thousands of vehicle applications for consumers worldwide.HISTORYIn the early 1960s, two motorcycle racers, Ken Johnson and Norm McDonald (K&N), developed a ground-breaking new idea for an air filter—one that could perform under the demands of dusty, dirty off-road environments. After experimenting with numerous types of filter media, they discovered that an oiled cotton design allowed the filter to not only capture contaminants very efficiently, but also allowed it to be washed and reused, and the original K&N High-Flow Air Filter was born. Five decades later, K&N is still innovating industry-leading filtration technology, and offers outstanding protection for everything from top-fuel dragsters to commuter vehicles across the globe.

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