i'm trying to find out what the heat range is on these things. Autolight says the heat range is 3, but im not sure what stock is for heat range. Anyone running these? I'm looking for plugs that are 2 heat ranges better than stock. I know the tr7ix are, but i cant find these locally; however, i can get XP103 plugs tomorrow. Can anyone help, i've searched and searched but i just got a headache from it. They seem so new that i cant find any info on them.