I am almost there but the car seems to be to drugged up to drive its lost its wildness and become something like cadillac (don't blame me if I can't spell it right I am english)
lower the car fully, and everything else dont matter.
But change the auto tranny to wide, then move the final gear (after u moved auto settings) all the way left.
Now with pratice u should be able to hit 270mph with ease and 285mph when drafting...this is with a fully modded Supra RZ (+1000hp, make sure u get the oil change)