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