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The Uni Filter NU-3425 motorcycle air filter is an open-cell polyurethane filter element. Its material allows maximum airflow while providing filtration. It is suitable for 80" Evolution Big Twin models from 1989–1992.
- Type: Air filter element
- Material: Open-cell polyurethane
- Airflow: Maximum
- Made in: USA
- Compatibility: 80" Evolution Big Twin models, 1989–1992