Fuel pump with nos
A more reasonable answer is 100 or less you are rater safe. Higher then that it is a good idea.
I ran 100 shot with the stock pump plenty of times down the track without issue.
The stock pump is only good to 4-450whp, I have a feeling you are making that before nitrous

IMO, upgrading the fuel system should be one of the first mods done any time you want to increase power above stock.
http://www.nitrousoutlet.com/catalog...0&product=3318
http://www.nitrousoutlet.com/catalog...3&product=3721

