aFe MagnumFLOW Air Filters P5R 3-1/2 F x 5 B x 4.5inv T x 7.5 HaFe MagnumFLOW Air Filters P5R 3 1 2 F x 5 B x 4. 5inv T x 7. 5 H Constructed with 100 percent polyurethane on top and bottom, this high flow, oiled performance filter is our highest flowing media for improved horsepower and torque. Five layers of progressively finer mesh cotton gauze media provide maximum airflow for best performance results. Washable and reusable for multiple cleaning cycles, the tall open evenly spaced pleats provide excellent dust