"Nerve-Damage"
Regular
According to this interview with Dan Greenawalt, a car in Forza 2 has as many or fewer polygons as a car in PGR3 which is 80,000 - 100,000 polys, including the interior. So roughly a half of that of GT5P.
http://www.watch.impress.co.jp/game/docs/20070326/fm2.htm
Thanks one for clearing that up!