So I'm picking up a set of 38lbers from a friend and going to get a TT chip to match, running 93 oct. Friend of mine recommend running colder plugs too, 42's i believe. My question is what will the colder plugs do. Also, I know stock the GNs were tuned way down, so what will the chip do to fix that, and generally how much can I expect to gain from all this?