I have a car that goes over 280 mph! It is called the IR-2 and it get over 1000hp to the wheels. It is 7gears AWD with max. width tyres that are semi slicks.
screen or didn’t happen 
Yap. Agreeing Tom 
It’s totally possible, I have no trouble believing OP has modelled such a vehicle.
But based on the same premise as my belief, I’m guessing that this car also has somewhere in the order of -25kg of downforce at 200km/h. Which is not exactly something that you want in a car that does 450km/h. Otherwise, stuff like this happens
As soon as I saw that link, I knew it was going to be the CLR.