AEM Brute Force Dryflow Air Filters are specially designed for tough off-road applications. They provide outstanding levels of filtration efficiency and capacity. AEM Brute Force Air Filters are oil-free and their synthetic media is incredibly easy to clean. Even more impressive, they are so durable that they maintain their shape under even severe abuse. AEM Brute Force Dryflow Air Filters are specially designed for tough off-road applications. They provide outstanding levels of filtration efficiency and capacity. AEM Brute Force Air Filters are oil-free and incredibly easy to clean.