supercharger
 

can someone tell where I can get a supercharger for a 1990 2+2 300zx n/t

ty

can't be done on original motor.
Unless you want to swap out to weaker maxima engine and then add a supercharger. But by the time you do all of that, it would of cost you the same amount to just drop in a twin turbo motor. Which is the way to go for all.