the power diff. between the two is about nil. not too sure about the green filter's filtration efficiency.search a little about it, the k&n is fine as long you dont get carried away re-oiling it. the filters ive seen made by better manufacturers are puny and will choke our endurance out. 
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let your old age be childlike, and your childhood like old age; that is, so that neither may your wisdom be with pride, nor your humility without wisdom.
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