Uprev is on all the time, you are not able to switch it off like a revo remap if thats what you are thinking about. Everyone who has had the uprev on their 350z have nothing but good words to say about it.
Steve W, your car sounds good and happy to hear you are happy with it. So hows the mpg these days driving on your daily commute? I have roughly the same mods as you to be interesting to see what power my car makes with the uprev