The Nissan GT-R R32 was released in 1989 as a base machine for Group-A racing. It was upgraded and became the R33 in 1995 and then R34 in 1999. In February 2002 a limited edition of the GT-R was released, called the "Nur" (after the Nurburgring circuit) equipped with the N1 racing specification engine and offering the upgrades of the V-spec II and the M-spec cars. The Nur was marketed as the last of the straight-6 engine GT-R, and the 1003 (718 V-spec II and 285 M-spec) vehicles produced under this spec sold out within 1 day!
This is partial text from the full article (usually with photos) at https://automodeler.com/news/nissan-skyline-gt-r-v-spec-ii-r34