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Smart Forfour Replacement Air Filters

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

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

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

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