The dry system pushes n2o into the intake tube before the throttle body, a small control box extends the injector pulses to accomodate the n2o and is constantly reading an O2 sensor just ater the header to make adjustments.

The A/F graph does look screwey. the tuner thinks it was missing (not pinging) and that one step colder iridium plugs are the problem (he thinks I should use std heat range racing plugs).

as for dyno posting etiquitte ! multiply by .97 if you want corrected numbers.

 

Yes you should run colder plugs. Epecially on that mixture. I have made that mistake before. And if you're able perhaps tune the mixture to about 12.5 across the board on the Nitrous.