I have used many types of air filters in many different bikes.
What I can add is that no matter which type you use you have to look after them.
I have found K and N air filter's very good and always help return very good MPG. Always coat the inside of the air box by wiping a oily rag in there. Make sure you have a good seal between the filter and the air box. Also clean the filter more often than you would if your riding in very dry dusty area's .
In over 100,000 miles In all conditions I have never had a problem with K and N filters.
ps They don't sponsor me
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