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BMW 523i Replacement Air Filters
Buy now from K&N's Online Store and get a 100% money back guarantee on any BMW 523i air filter!
- Designed to Increase Horsepower and Acceleration
- High Air Flow with Excellent Filtration
- Top Performance Accessory for BMW 523i Models
- K&N Million Mile Limited Warranty®
Order your K&N replacement air filter Factory Direct today! Help your BMW 523i run better. Fast and FREE SHIPPING with any BMW 523i air filter
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