please ask what kind of nitrous you should get, NOS is a brand of nitrous, and to answer your question, zex and venom are very respectable nitrous companies, slightly more expensive, but might save your engine from a lot of trouble, there are all types of different nitrous setups, direct port probably being preffered over most, and many types of engaging nitrous, many people hook their nitrous up to their TPS(throttle position sensor) and those people I guess have the confidence that they will never miss a gear in a life, if thats the case, then it is a good way to go, for the rest of us that miss an occasional gear, you could either have a manual nitrous button of a computerized nitrous system from venom or zex. I hope my information is helpful