are you spraying nitrous into the intake as an intercooler? or onto an intercooler... you can do both, it's effective either way...
the cooling effect of the nitrous is similar to using a water injection system, but with the nos you get the added bonus of the extra power...
the nitrous will chill the incoming air, as well as increase the compression in the cyl as there is more o2 in there... so it will add boost as well as power... the thing to note though, is that nos makes the exh gas reallllllly hot, and anything over 1100 degrees f will melt pistons, and with that much power w/nos and s/c, you can do it quick...
so do it right and it'll work...
what kinda s/c and which motor is in that car? is it a 5.0?