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The Hiflofiltro HFA4923 air filter directly replaces the factory filter on the Yamaha YZF-R1 and fits in the factory airbox. Its filter media is designed for modern, high-performance engines.
- Type: Motorcycle air filter
- Compatibility: Yamaha YZF-R1 2009–2014
- Installation: In the factory airbox
- Replacement: Direct replacement for the original equipment filter