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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K&N Air Filters are custom designed for you specific year, make and model, giving you better performance than stock filters. K&N filters never need replacing and even improve your fuel economy. 10-year/1,000,000-mile warranty.