Only aFe's Pro 5R media is progressive in nature, offering 5 layers of progressively more tightly woven cotton gauze for protection levels in the high 98% range without sacrificing airflow.
These aFe Pro 5R washable/reusable cotton air filters are made from high-quality materials to ensure a tight seal without gaskets or sealants. They're available in a variety of shapes and sizes and outflow any other filter on the market. Since air moving in a straight line flows faster, these filters can actually improve airflow and fuel economy. Pro 5R provides the highest air flow levels for the largest gains in horsepower and torque for times when performance is everything.