Quote from tristancliffe :

Some cars (e.g. the Trevor Sagaris) have big ugly holes in the wheelarches to let some of the excess air out! If you were air, a wheelarch isn't somewhere you'd choose to hide!

Nothing to do with the topic, but actually the vents in the Sagaris are closed and only there for looks in the production version, not sure why tho.

Quote from Jouni Trogen :

Real results :

1. Caterham Superlight R .......... 8 min 6.2 sec
   
2. Ruf 911 CTR2 ....................... 8 min 15.0 sec
   
3. Nissan Skyline GTR .............. 8 min 28.1 sec
   
4. Porsche 911 Carrera ............. 8 min 38.4 sec

Tested by some amateur driver obviously..in the hands of a professional driver the gt-r and the ruf can both lap in less than 8 minutes, even got videoproof of a 7:59 stock gt-r lap. And seeing a 996 turbo can lap in 7:56 i suppose the ruf should easily lap in less than 8 minutes. And oh, the caterham's R500 superlight has been clocked at 7:55.

A good-ish laptime list here with sources included: http://forums.finalgear.com/showthread.php?t=14757

Still can't really be compared as almost every laptime's been done by a different driver, the ruf CTR2 is for example marked as 8:15 because there hasn't been proof of a better lap yet..it doesn't mean it couldn't do better.