nitrous isnt dangerous for an EFI car especially if your only running a 100 shot.
As said above, Its ALL about the tuner.If its tuned right you should be ok.
This is what I do, and you will be ok . As long as you do not go around spraying all the time you should be just fine. The more you learn the more you will be safe.One question I have is how often can you use it? I know a certain amount of self control has to be used but I also don't want to be scared of it. If I go to the track and make 5 runs that night with spray and do this weekly, am I asking for trouble? I go to the track nearly every Friday.