wet kits spray fuel into the intake as well as nitrous. dry kits only spray in nitrous. i'm not sure if X's have returnless fuel systems or not. i really don't see a point in puttin nitrous in an X as nitrous is more for racing applications. you won't be able to use it offroad as it will backfire and blow up the engine if under 3000 RMPs. at least this was the case with saturns. trade urs for an SE S/C or 05 X and save yourself the hassle.