The K&N 33-3028 high-flow air filter is reusable and made from four layers of oil-impregnated cotton material. Its construction improves airflow and traps dust, dirt and contaminants, while being designed to increase horsepower and improve acceleration. It is a direct replacement for the factory air filter and comes pre-oiled for installation.
- Type: High-flow air filter
- Material: Oil-impregnated cotton
- Layers: 4
- Reusable: Yes
- Cleaning: Every 75,000 km or 5 years under normal highway driving conditions
- Installation: Direct replacement for the factory air filter
- Condition on installation: Pre-oiled
- Compatibility: BMW X3, X4, X5, 5 Series, 7 Series