Not an answer to your question but, with the hypertech, nitrous isn't going to help much. I doubt it is fueling hard enough for nitrous to do anything. You gotta have fuel to burn to see much improvement. Take that money and spend it on a good EFI Live tune, then you will probably have more power all the time.
Not to mention the truck will run better and you can add a turbo brake. Nitrous is for racing not DD. Get yourself a set of tunes form a reputable tuner and you will be much happier with the end result...