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Audi S4 Replacement Air Filters

Buy now from K&N's Online Store and get a 100% money back guarantee on any Audi S4 air filter!

  • Designed to Increase Horsepower and Acceleration
  • High Air Flow with Excellent Filtration
  • Top Performance Accessory for Audi S4 Models
  • K&N Million Mile Limited Warranty┬«

Order your K&N replacement air filter Factory Direct today! Help your Audi S4 run better. Fast and FREE SHIPPING with any Audi S4 air filter

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