The DNA air filter is a high-flow filter for the Smart Forfour 453 with a 0.9 L engine, model years 2014–2018. It is designed to fit in the factory airbox and can be washed and reused. It helps increase horsepower and acceleration while still providing filtration.
- Type: High-flow air filter
- Compatibility: Smart Forfour 453 0.9 L, 2014–2018
- Installation: In the factory airbox
- Washable: Yes
- Reusable: Yes