Be overcareful when using nitrous with any Contour engine, as both the Duratec and Zetec use hyperutectic pistons, and they will shatter easily under nitrous detonations.
A 125HP shot with no tuning is not the best idea, its just taking to much of a chance, sooner or later odds are something will go wrong.
I'm careful with my Zetec and I know I can replace the whole damn motor for $300 or less.
Also, taking the time to really tune for nitrous allows you to get the most from your nitrous setup.
