The K&N 33-3171 air filter is a reusable, high-flow filter made with multiple layers of oil-impregnated cotton gauze. Its engineered filtration medium promotes airflow and captures particles. It is designed to increase horsepower and acceleration and improve engine performance. It comes pre-oiled and fits in the factory air box.
The filter is washable and reusable. Under normal highway driving conditions, it needs to be cleaned every 120,700 km.
- Type: High-flow air filter
- Filter media: Multiple layers of oil-impregnated cotton gauze
- Reusable: Yes
- Washable: Yes
- Pre-oiled: Yes
- Cleaning interval: Every 120,700 km under normal highway driving conditions
- Compatibility: BMW M2, BMW M3, BMW M4