FWIW....
I have done back to back track testing with a K&N and a quality paper filter. My '79 with a 474 engine runs high 11's in the 1/4 at 119mph, no difference in performance.
Hold a K&N filter up to the light and notice how porous they are. Well that porosity is letting micro-dust particles in your engine.
I'll never put a K&N filter on a car.
However, back in the 70's I used them on my motocross cycles because they were designed for off-road, dirty conditions. The K&N representative at the tracks told us that they are designed to run dirty and should NOT be cleaned unless the dirt was caked-on the filter.
Just food for thought.
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