I'm one of the few "suckers" who played through the game and busted my butt with a joystick to get the X2010 on my own with the Sebastion Vettel Challenge on A spec lvl 30.
Those who believe in the X2010 as a possible real car that can really do 9 G's are setting themselves up for humiliation. But I will admit I believe this car is possible in real life and with the lap times (1:03 at Suzuka, 1:04 at Nurburgring GP, 0:31.5 at Indy, etc.)
I believe Andrey Newey when he says a fan car can do that kind of performance. Maybe not at an old circuit but a modern day one like Turkish GP, or Bahrain could probably handle its sheer speed & grip without making it unstable.
I;ve been to numerous airshows. Every other year we have an airshow here in Duluth that features the blue angels, Navy demos, Canadian AF demos, and last but not least stunt plane demos. These aircraft are capable of far more than 9 Gs, and the pilots do these moves for 10 or sometimes 25 minutes at a time. Call me a "simpleton" from a small town who doesnt know anything but if Newey and Red Bull say they can do it I believe em'.
Just my 2 cents.