The aFe MagnumFORCE Intakes Stage-1 PDS AIS PDS BMW 540i (E39) 97-03 V8-4.4L is a performance air intake system designed to improve the engine's power, torque, and fuel economy. It features a high-flow, one-piece sealed housing with a washable/reusable air filter and a custom-tuned intake tube. The intake tube is designed to reduce air turbulence and increase air velocity for maximum performance. The intake system also includes a Pro 5R air filter for maximum airflow and filtration, and a Pro-Dry S oil-free air filter for easy maintenance. The system is designed to provide increased horsepower and torque, improved throttle response, and increased fuel economy.