The voices in my head are trying to talk me into having NOS fitted to my Audi while i have the head,cams and injectors done. Anyone have any views as to weather i should or shouldn`t do this? More importantly i would like as much info as possible on the subject as in which are the better brands to have, what i would need in the kit, any recommendations of good companies to get stuff from and finally how much is it likely to cost?