A couple of reasons
1. I ride in the dust a lot, so my air filter becomes clogged and dirty very quickly
2. Cost - A BMW paper filter costs $60 (NZD) and a K&N is about $100, the K&N I can use a large number of times if I look after it.
I currently use them in my racing cars, so i have all the cleaning/oiling kits for them, but I am not sure about using them in bikes??
Cheers
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