The DNA free-flow air filter for BMW E39 is designed to fit into the existing factory airbox. It is washable and reusable, and is designed to increase horsepower and acceleration while providing filtration.
- Type: Free-flow air filter
- Compatibility: BMW E39, BMW 5 E39 525i 00–04
- Reusable: Yes
- Washable: Yes
- Installation: In the factory airbox