The DNA air filter for the Ford Focus ST 2.0L Diesel is a high-flow air filter designed to fit in the existing factory airbox. It is washable and reusable, and its design aims to increase horsepower and acceleration while filtering the air.
- Filter type: High-flow air filter
- Compatibility: Ford Focus ST 2.0L Diesel, 2014–2018
- Installation: Fits in the factory airbox
- Maintenance: Washable and reusable