I don't think nitrous adds any more pressure than x amount of boost from a blower or turbo...
Some people just retired their timing accordingly manually. And run and all in retarded timing. Me personally I opted for a timing retard mechanism that piggybacks to my MSD.. it was extremely easy to set up and just requires a low voltage signal. I have that signal hooked up to my activation button and the general rule of thumb is to turn down your timing 2 degrees for every 50 horsepower of nitrous...
