God, that looks so fun.
On a side note, the comparisons against the GTR are lame.
-What are the power-to-weight ratios of both?
-Weren't the GTR runs at the 'ring during the cold in November? I mean, you're talking a difference of 2 seconds at two completely different temperatures.
-The Nurburgring wasn't closed down for the GTR while running there; it had to pass several cars.
-Although the ZR1 doesn't have r compounds, it's still using tires specifically developed for that car.
-Also, the driver of the ZR1 would have to learn that track somehow, so my guess is he's had several hundred laps there before in order to know it well enough.
-The "race car driver" of the GTR is actually just a factory test driver for Nissan.
-The ZR1 did the lap from a rolling start, though I'm not sure how the GTR began.
I think that comparing a difference of 2 seconds on a track as large as that is pointless, there are so many factors. Put the same driver in both and see the times. I'm not saying the GTR would win, but it would be an actual respectable comparison.
That said, I'd take a pretty ZR1 over that Nissan pile any day.