You could buy a generic nitrous kit like a Zex kit and run a 55 shot. It could probably take up to a 75 shot dry but you don't really want to push it on a new car. I wouldn't buy a single aftermarket part other than that until at least a year or two has passed because it usually takes this long for people to figure out what they're doing with a car and parts you buy before then may suck and cost too much. For example, the first exhaust that came out for the 350z actually lost power. Keep in mind that you'll have to completely rip the nitrous out and leave no traces if you take it to the dealership or your warranty is out the door in a heartbeat. That's why I'd go with a dry nitrous kit like Zex, pretty damn easy to put back to stock in an hour or so.