The reusable high-flow K&N air filters feature state-of-the-art oiled membrane design with a multi-layered membrane designed to improve air flow and collect pollutants, and are designed to provide increased horsepower. Each performance air filter is reusable, built to withstand the lifetime of your vehicle, and backed by K&N's 10-year/million-mile warranty. K&N replacement filters are drop-in designed to easily install in your factory air box.