this could mean either that's all its got or there is a govenor on that vehicle which stops the car at a certain speed.
you crash
rev limiter will only let the RPM's get so high then it cuts back
there must be a speed limter on it to 50mph
No, it's a high-speed train
If by falls in its face you mean loses all power this is normal. It is called a speed governer. It cuts your fuel once you reach that rpm. The only way to get rid of it is to remove your speed sensors or modify the ECU.
a high quality car, fast acceleration or top speed hot rod
This question makes no sense, what do you mean? the speed of the car does not dictate the posted speed limit.
Top speed of the car that can go
I'd check the Neutral safety switch.
timing belt may have snapped
Buggati veyron with a top speed of 408.47 km/h .
we should not drive a car in a high speed