Alpina B4s Replacement Air Filters

Buy now from K&N's Online Store and get a 100% money back guarantee on any Alpina B4s air filter!

• Designed to Increase Horsepower and Acceleration
• High Air Flow with Excellent Filtration
• Top Performance Accessory for Alpina B4s Models
• K&N Million Mile Limited Warranty®

Order your K&N replacement air filter Factory Direct today! Help your Alpina B4s run better. Fast and FREE SHIPPING with any Alpina B4s air filter