love my NX stuff,
Nitrous only makes your motor live less if you dont be on safe side, nitrous dont blow up motors the guy tuning the nitrous does.
For mine 200 shot, I retard timing 4 degrees per 100 shot of nitrous, I have a seperate fuel system for the nitrous and run 9lbs pressure (safe side) and I also run fuel saftey switch and wide open throttle switch. Safe tune up is better, fuel pressure, timing are major.