I fully upgraded my car (Dinka Jester (Racecar)) and as you can see the acceleration has reached the maximum. There is another car out there called "Massacro (Racecar)" with an even higher acceleration, but worse other attributes. -> See here
If I upgrade both, will they really have the same acceleration? If yes, the Massacro would be a bad choice if you ask me. It's more expensive and the rest of the attributes are lower.
Or is it just the bar that won't display values that are even higher?