Camfantasy
Valar Morghulis
A twin turbo V-6. Not that impressive when you consider they're getting over 300 hp out of a naturally aspirated V-6 these days.
Name me another production v6 naturally aspirated or forced induced that can beat a gtr on the Nurburgring. The Dodge Viper ACR (8.4L V10) And the Lexus LFA (4.8L V10) are the only productions cares who have better times that the gtr.