Vid looks legit to me..
Maybe Porsche's driver just sucks...

Or Nissan's driver is more accustom to the GTR, and knows its strengths and limitations better than Porsche's driver.
No 2 drivers are going to get the same time in one car, and then get the same time in 2 completely different cars. Unless some crazy voodoo majic is going on...
Dang.. i spent 18 hours working on my car yesterday and didnt have motivation to work on it today.. Video sure helped with that..
