Description
A restrictive stock air filter robs your CB400 of breathing room and forces your engine to work harder than it should. The UNI FILTER NU-4033 delivers measurably higher airflow while maintaining precision fit to your original airbox, giving you cleaner combustion and more responsive throttle feel. Best of all, this filter pays for itself within the first year—simply clean and re-oil it indefinitely instead of buying disposable replacements.
- Fitment: CB400 (’78-’81)
- Material: High-flow foam
- Installation: Bolt-on, no modifications
- Airflow: Exceeds stock element
- Cleaning: Dish soap, warm water
- Service life: Indefinite with maintenance
- Pre-treatment: Requires oil before install
- MPN: NU4033
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