ROFL, just cos a car is set up for drifting does not mean they slide at the slightest touch of throttle, REAL D1 cars can be used in touge racing, and they have been, just youtube D1 touge... You wouldn't be able to drive around the circuit properly quick with the D1 cars in GRID, I have played the full version on both X360 and PC with a G25. I didn't notice a difference in the physics between demo and full version TBH, they both sucked more than a dyson on steroids.
/rant
/ontopic I will wait to see about this GTR X360 game, from past experience GTR2 is undriveable without a good wheel, and the M$ wheel is not a good wheel by any means. I hope they tweak the physics and controls for the 360, for the better. After all, GTR2 has a shedload of buttons that won't fit on a controller. (Headlights, window wipers, brake balance, allsorts of crazy stuff :D)