The K&N 33-3051 air filter is a high-flow filter designed for the factory BMW airbox. Its layers of oiled cotton material help increase airflow and trap contaminants, and it is designed to help increase horsepower. It is washable and reusable.
- Type: High-flow air filter
- Material: Layered oiled cotton
- Dimensions: 260 x 267 mm
- Compatibility: BMW 2 Series, BMW 4 Series
- Cleaning: Washable
- Reusable: Yes