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BMW X3 Si Replacement Air Filters
Buy now from K&N's Online Store and get a 100% money back guarantee on any BMW X3 Si air filter!
- Designed to Increase Horsepower and Acceleration
- High Air Flow with Excellent Filtration
- Top Performance Accessory for BMW X3 Si Models
- K&N Million Mile Limited Warranty®
Order your K&N replacement air filter Factory Direct today! Help your BMW X3 Si run better. Fast and FREE SHIPPING with any BMW X3 Si air filter
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