AEM Dryflow® Air Filters are high quality reusable performance air filters. Unlike most washable cotton performance air filters, AEM Dryflow® Air Filters do not require filter oil and are very easy to clean. The special AEM three dimensional filtering media allows us to achieve high airflow and low restriction without compromising high filtration levels or dirt capacity. This hybrid technology uses both depth loading and structural screen wire to enhance airflow capabilities and durability. The result is a true performance air filter designed to improve horsepower without the inconvenience of oil.