I agree that KN does not filter that great and maybe it is designed for high RPM but numbers are numbers.
https://www.knfilters.com/dynocharts/57-2567_dyno.pdf
I have been involved in all aspects of engine building and racing for 20 years now. There is so much complexity to this conversation that i think we could come up with 100 different opinions, that in a way are all right. You are correct in saying that with headers it all comes together and will make a big difference. Like anything in engines, if you want another 50 HP pull out another 5 grand. To some it is not a money issue, and to others it is. if i had the time i would mount twin turbos and give it about 6lbs, then the 5k would make about 125hp.
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