Amazon.com: K&N Engine Air Filter: Increase Power & Acceleration, Washable, Premium, Replacement Car Air Filter: Compatible with 2006-2014 BMW (128i, 328i, 325i, 328i xDrive, 330i, 130i, 328xi), 33-2332 : Automotive
Drop in air filter (K&N and the like) - XBimmers | BMW X3 Forum
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K&N air filter - XBimmers | BMW X3 Forum
Does anyone know if I can use K&N air filter cleaner - BMW 3-Series (E90 E92) Forum
K&N Filter any louder? BMW 2.0 Diesel K&N Air Filter Change N47 120D 220D 320D 420D 520D 33-2990 - YouTube
For 07-12 BMW 328i E90/E92/E93 3.0L 6cyl Black Cold Air Intake + K&N Air Filter | eBay