I like to keep the rev's in the 5000 to 8,000 range. The more hard core guys will go all the way to 8,400
Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."