AEM Dryflow Air Filters are washable synthetic air filters designed for an optimum combination of air flow, filtration, and performance. AEM Dryflow filters use an innovative high performance oil-free filtration material that allows easy cleaning, durable service, and excellent filtration. Replacement air filters for street vehicles come with a lifetime limited warranty. Other air filters come with a one year limited warranty. AEM Dryflow Air Filters are washable synthetic air filters designed for an optimum combination of air flow, filtration, and performance. They use an oil-free filtration material that allows easy cleaning and excellent filtration.