Not Ranked
I recall a dyno test where they reported the filtered top cost them H.P. They tested several air filters (different sizes...all K&N) and I was surprised that the best (H.P. wise) was one of the smaller (Dia.) filters. Of course a stationary dyno vs. a moving cobra with a hood scoope... who knows. On the other hand I will walk into a room and can't remember why I came in there. So maybe we shouldn't trust my memory!
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