Air filters and spark plugs are not on my approved topics to give a shit about, but here's my in depth response.
I run long filters because my bike seems to run good with them, plus I think they look cool.
I run B8ES spark plugs gapped at box spec because my bike runs good with them that way. I also don't own a spark plug gapper so it would be impossible for me to gap them.
And yes, I'm in the 99%. I don't build motors or test them on either of my two imaginary dynoes. Therefore I set up my motors per my motor builder's suggestions based on his many years of building and testing.
And since my stuff runs good and because I win races and am not constantly working on said stuff, people should listen to me.
I hope this response will suffice and help move the topic forward as well as educate.