The DNA P-H35SC21-01 motorcycle air filter uses FCd (Full Contour Design), allowing the filter media to follow the contours of the airbox and make use of a larger active surface area. It has 4 layers of cotton and a filtration efficiency of 98–99% according to ISO 5011. Its measured airflow is 189.70 CFM, compared with 97.82 CFM for the stock Honda filter under the same conditions.
Its construction is designed to provide an airtight fit in the airbox, and the filter is intended for road and city use.
- Type: High-flow motorcycle air filter
- Design: FCd (Full Contour Design)
- Filter media: 4 layers of cotton
- Filtration efficiency: 98–99% according to ISO 5011
- Airflow: 189.70 CFM at 1.5" H2O and 25°C
- Airflow increase: 93.90% compared with the stock Honda filter
- Use: Road and city
- Compatibility: Honda SH 350i 2021–2025, Honda Forza 350 2021–2025, Honda ADV 350 2022–2025, Honda Forza NSS 250 2021–2023
- OEM part numbers: 17210K1BT00, 17210K1BD00
- Equivalent K&N part number: HA-3521