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NU-4137ST Air Filter - Honda
- Designed to fit in the factory airbox UNI FILTER’s high air flow, superior dirt stopping ability, and long lasting dependability have made the PRO COMP II.
- The bestselling replacement air filter for competition motorcycles.
- The UNI FILTER’s unique two-stage design allows for easy and complete cleaning.
- The outer layer can be used dry as pre-filter allowing for longer intervals between cleanings, or it can be oiled for superior engine protection in unusually wet conditions.
- *The inner filter must always be oiled.
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