Ford Focus ST Replacement Air Filters

Buy now from K&N's Online Store and get a 100% money back guarantee on any Ford Focus ST air filter!

  • Designed to Increase Horsepower and Acceleration
  • High Air Flow with Excellent Filtration
  • Top Performance Accessory for Ford Focus ST Models
  • K&N Million Mile Limited Warranty®

Order your K&N replacement air filter Factory Direct today! Help your Ford Focus ST run better. Fast and FREE SHIPPING with any Ford Focus ST air filter

  1. 2022 Ford Focus ST 2.3L L4 Gas air filter
    RON 215.39
    KNX-3131
    K&N
  2. 2022 Ford Focus ST 2.3L L4 Gas air filter
    Regular Price RON 478.19 Special Price RON 382.59
    33-3131
    K&N
  3. 2021 Ford Focus ST 2.3L L4 Gas air filter
    RON 215.39
    KNX-3131
    K&N
  4. 2021 Ford Focus ST 2.3L L4 Gas air filter
    Regular Price RON 478.19 Special Price RON 382.59
    33-3131
    K&N
  5. 2020 Ford Focus ST 2.3L L4 Gas air filter
    RON 215.39
    KNX-3131
    K&N
  6. 2020 Ford Focus ST 2.3L L4 Gas air filter
    Regular Price RON 478.19 Special Price RON 382.59
    33-3131
    K&N
  7. 2020 Ford Focus ST 2.0L L4 Diesel air filter
    RON 215.39
    KNX-3131
    K&N
  8. 2020 Ford Focus ST 2.0L L4 Diesel air filter
    Regular Price RON 478.19 Special Price RON 382.59
    33-3131
    K&N
  9. 2018 Ford Focus ST 2.0L L4 Diesel air filter
    Regular Price RON 534.19 Special Price RON 427.39
    AEM-AE-20993
    K&N
  10. 2018 Ford Focus ST 2.0L L4 Diesel air filter
    RON 215.39
    KNF-2993
    K&N
  11. 2018 Ford Focus ST 2.0L L4 Diesel air filter
    Regular Price RON 534.19 Special Price RON 427.39
    E-2993
    K&N
  12. 2017 Ford Focus ST 2.0L L4 Gas air filter
    RON 215.39
    KNF-2993
    K&N
  13. 2017 Ford Focus ST 2.0L L4 Gas air filter
    Regular Price RON 534.19 Special Price RON 427.39
    AEM-AE-20993
    K&N
  14. 2017 Ford Focus ST 2.0L L4 Gas air filter
    Regular Price RON 534.19 Special Price RON 427.39
    E-2993
    K&N
  15. 2016 Ford Focus ST 2.0L L4 Gas air filter
    Regular Price RON 534.19 Special Price RON 427.39
    AEM-AE-20993
    K&N
  16. 2016 Ford Focus ST 2.0L L4 Gas air filter
    RON 215.39
    KNF-2993
    K&N
  17. 2016 Ford Focus ST 2.0L L4 Gas air filter
    Regular Price RON 534.19 Special Price RON 427.39
    E-2993
    K&N
  18. 2015 Ford Focus ST 2.0L L4 Gas air filter
    Regular Price RON 534.19 Special Price RON 427.39
    AEM-AE-20993
    K&N
  19. 2015 Ford Focus ST 2.0L L4 Gas air filter
    RON 215.39
    KNF-2993
    K&N
  20. 2015 Ford Focus ST 2.0L L4 Gas air filter
    Regular Price RON 534.19 Special Price RON 427.39
    E-2993
    K&N
  21. 2014 Ford Focus ST 2.0L L4 Gas air filter
    Regular Price RON 534.19 Special Price RON 427.39
    AEM-AE-20993
    K&N
  22. 2014 Ford Focus ST 2.0L L4 Gas air filter
    RON 215.39
    KNF-2993
    K&N
  23. 2014 Ford Focus ST 2.0L L4 Gas air filter
    Regular Price RON 534.19 Special Price RON 427.39
    E-2993
    K&N
  24. 2013 Ford Focus ST 2.0L L4 Gas air filter
    Regular Price RON 534.19 Special Price RON 427.39
    E-2993
    K&N
  25. 2013 Ford Focus ST 2.0L L4 Gas air filter
    Regular Price RON 534.19 Special Price RON 427.39
    AEM-AE-20993
    K&N
  26. 2013 Ford Focus ST 2.0L L4 Gas air filter
    RON 215.39
    KNF-2993
    K&N
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