if im wrong im sure ill be corrected, but a wet shot basically is fuel and nitrous and dry is just nitrous. wet is better because too much nitrous and not enuff fuel = boom. direct port is the best way to go also, meaning each cylinder gets equal amount of nitrous instead of it just goin into your intake and say only one or 2 of your cylinders gettin all the juice. nx makes this new thing called nozzle that is basically direct port wet shot without having to drill into your intake manifold. zex is safe because the computer unit you get wont let you put too much nitrous and not enough fuel and im pretty sure you can set it up for direct port (might work with nozzle?) as for bottle warmers, not quite sure youd need one unless you live up north cuz gas tends to contract when cold which means it could turn into liquid, again not sure. i would definately recommend a purge kit with any system you might get and i think the general rule of thumb wit nitrous is dont shoot more than 1/2 your hp.