The K&N roto-molded cold air intake for BMW 3 Series (1999–2005) increases airflow with a high-density polyethylene tube and includes a washable, reusable high-flow oiled cotton filter. The oversized conical filter allows extended service intervals—up to 100,000 miles under normal highway driving—and the system uses a heat shield to reduce intake air temperatures. Typical installation is under 90 minutes and it’s covered by K&N warranty.
K&N 99-05 BMW 3 Series Performance Intake Kit