nitrous spark plug

yes I plan to go to a single plane. been looking but have not found what I wanted yet. I pulled all the plugs they all seemed the same front to back. my plate seems to be spraying very evenly. I have a wide band in the car it ran about 10.9 though the short burst. I read monty smith said 12.5 is the recominded area for the wideband. that and reading the plugs of course. I going to use the n9yc this weekend at the track and will have the help of seasoned plug readers.