I heard that we cant use N20 "Dry" system for the celi, because it has a returnless fuel system, but if you add a SF Fuel rail that adds a fuel return line, couldnt you then add a dry system, or am i completly wrong??
do not add a dry system to your car.and just by adding the rail,wont allow you to go dry nitrous.and make sure you know what you are doing with the rail/return line(you have to get the correct preasure to the rail and if you are not on or about the right preasure you would run lean at hi rpms and you might severely detonate if the outside tems are hi!
one of the main reasons why a dry system is not recomended for the celica is because of the hi compression,and to a lesser extent the returnless fuel sytem.
changing the rail alone wont be a good idea,unless you are going forced induction,and you have to get a new pump/and regulator as well.
if it is not a matter of life and death i think uou should stick to the wet system(and i meant life and death of your motor,the fuel in the mix helps to knock down detonation in the wet set up esp.with the hi comp celica engine.
you can always enquire from someone else if you think what i have just said doesnt make sense.or you can ask and i can get into more details if you want.