Description
The stock air filter on your CBR900RR restricts airflow and requires frequent replacement, cutting into both your performance and your budget. The UNI FILTER NU-4121 delivers measurably higher airflow while maintaining a precision fit to your stock airbox, giving you better throttle response without modification. With an indefinite service life, you’ll simply clean and re-oil it—no more disposable filters.
Technical Specifications:
- OEM fitment: CBR900RR
- MPN: NU-4121
- Material: High-flow foam
- Installation: Bolt-on
- Increased airflow: Stock comparison
- Cleaning: Dish soap, water
- Service life: Indefinite
- Pre-installation: Requires oil treatment
- Airbox compatibility: Stock housing






Reviews
There are no reviews yet.