There are plenty of imitators, but only one company can claim the title of inventor of the reusable cotton gauze air filter-K&N. K&N is continually engineering new air intake systems to unlock your motor's hidden horsepower and mileage.
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Maximize your airflow to gain unreal power with K&N XStream Round Air Filters. K&N filters are universally sized to replace the top of most air filter assemblies on caburated engines. Available with a red, blue or chrome ring. 10-year/1,000,000-mile warranty.