Aeromotive In-Line Filter - (AN-12 ORB) 10 Micron Microglass ElementFinally, a place where bigger really is better. What defines an efficient filter? As little pressure drop as possible. How do you achieve a low pressure drop? Surface area. How do you get a lot of area into a compact in line filter? Pleats. More pleats means more surface area and, in turn, better flowing filters. Aeromotive in line filters boast the most surface area possible for the highest flowing filters. Machined out of aircraft grade billet