also a 50shot = ~50hp no matter what way you slice it...
Not really, I have seen several dynos of various NOS(the brand name) systems in Hotrod and (i think) Import tuner Magazine that netted more HP than the advertised shot(usually by about 5-8 hp) Also with the topic at hand injecting N2O into charged (read: hot) air the coolong effect alone will net you several more HP than just what the shot itself advertises.