ˈoʊnli wˈʌn ˈɑːɹ θɹˈiːhˈʌndɹɪd nˈaɪnti ɹˈoʊd kˈɑːɹ wʌz ˈɛvɚ pɹədˈuːst baɪ nˈɪsɑːn æz ɐ pɹˈoʊɾoʊtˌaɪp fɚðə dɪvˈɛləpmənt ʌvðə ɹˈeɪskˈɑːɹz ænd wʌz nˈɛvɚɹ ɪntˈɛndᵻd fɔːɹ sˈeɪl, ɔːlðˈoʊ nˈɪsɑːn dˈɪd ˈɔfɚ tə bˈɪld fˈɜːðɚ vˈɜːʒənz æɾə vˈæljuː ʌv jˌuːˈɛs dˈɑːlɚ wˈʌn mˈɪliən.
Only one R390 road car was ever produced by Nissan as a prototype for the development of the race-cars and was never intended for sale, although Nissan did offer to build further versions at a value of US$1 million.