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Regardless of what anyone says, just stay stock except for the fluid.
I've been in cars with instructor (may used to race or still race) who were flying around the track in completely stock cars. One fast guy was in an F30 328 on run flats and was flying around the track. Same guy took his stock F150 out and wasn't easy to catch.
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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." 
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