The typical cycle is 10,000 miles. You may also want to look into getting a reusable K&N filter -- you just need to clean it with their special products about every 10,000 miles. Also, take into consideratrion the possibility of a cold air intake. If you have that in your plans, you will not be using the stock airbox anymore, and wil be needing a different type of filter (cone).
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Originally Posted by BMWBeauty416
I'm scared if you took pictures of me cleaning a rifle Dave might consider it porn