But we also have to consider some gearing into this thread.
If one sprays a 200 shot of juice at 2000 in first, No big deal, saying traction is not a problem, First gear revs extremly fast with a 200 shot and will be up in the RPMS pretty fast and staying High.
Now if one was to hit the nitrous at 2000 in 4th gear, I could see a KABOOM effect.....

 

Kryckter is right..... This is pointed out on NX's website: The RPM level is not as important as is the motors ability to rev freely when the nitrous is engaged, I.E. If the vehicle is in low gear, nitrous can be engaged at any time, but if the vehicle is in a higher gear moving at a slow speed when the nitrous is engaged the engine will detonate and damage will occur.