The aFe MagnumFORCE Intakes Stage-1 PDS AIS PDS BMW 525i/528i (E39) 97-03 L6-2.5L/2.8L is an intake system specifically designed for the BMW 525i/528i (E39) 97-03 L6-2.5L/2.8L. This system is designed to provide maximum airflow and power while still retaining the factory emissions equipment. It features a Pro 5R air filter with a 5-layer progressive oiled cotton media, and a one-piece sealed housing with a built-in sight window for easy filter inspection. The intake system also includes a heat shield that helps to protect the filter from engine heat and reduce intake temperatures. This system is designed to provide improved performance, throttle response, and increased horsepower and torque.