The D2 replaceable filter is designed for convenience: no cleaning, drying, or re-oiling required. Engineered to deliver strong, consistent airflow while effectively capturing dust and debris, its advanced fiber construction balances optimal filtration with maximum performance. When its time for service, simply swap it out and go. aFe POWER performance air filters use a rounded, evenly spaced pleat design which allows for more usable filter surface area, providing increased flow and greater dust holding capacity. This aFe POWER performance air filter is constructed with a polyurethane base and top. Unlike other materials that degrade after repeated heat cycles in an engine bay, polyurethane maintains its original molded shape.