Fantasic videos.
Those are Ricers wet dreams to the max...
A couple things though - it would seem the NSX driver really has good track knowledge - he was making confident choices to pass outside/inside at various times giving up a pass to set himself up for a better inside or outside line in the upcoming corner - and then pass.
Also, those guys are on the very ragged edge... the ragged edge that is very far away from any of those cars in stock form.
I mean when he and the black Skyline had to checkup for the white car going off they both ended up oversteering there way through - probably only skill and experience kept them out of the inside runoff.
Very nice demonstartion of how modified cars are no real representation of their stock counterparts...