The aFe MagnumFORCE Intakes Stage-1 P5R AIS P5R BMW Z4 (E85) 03-05 L6-3.0L M54 is a performance air intake system designed to improve the power and torque of your BMW Z4 (E85) 03-05 L6-3.0L M54. This intake system is constructed from high-quality materials and features a one-piece sealed housing with a washable/reusable conical air filter for maximum airflow. The housing also features a Pro 5R oiled 5-layer performance air filter for maximum filtration. This intake system also includes a heat shield to protect the filter from engine heat and a built-in velocity stack for improved airflow. Additionally, this intake system is designed to provide easy installation and is 50-state legal (CARB E.O Number D-550-14).