The rule is that you can half of you'r stock horsepower in forced induction, so if you'r motor comes with 100 hp stock you can safely run a 50 shot. I would definally check you'r compression before you put a bigger shot on because nos will fry the shit out of you pistons and rings, so just make shure they are in good shape and hold compression. Also run colder plugs and like everyone else said retard you'r timing when you want to squeeze, you can just make 2 diffrent marks on you'r dizzy so when you hit the track you can change it.