No noise for me.
The problem is, how do you tell the dealer when you hear the noise? "Well, I was at the track and the diff starts making a lot of noise after 15 minutes on the track..."
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."