It's not a bug, there are some handling flags which can't be overwritten. Counthash has one of those flags enabled which basically gives it insane acceleration at low speeds, to counter that it has mediocre acceleration at high speeds.
And that speed loss happens to every car in the game, to some it happens more, to some less. Every car has its pros and cons, basically, you really seem to be ignoring its pros.
And that speed loss happens to every car in the game, to some it happens more, to some less. Every car has its pros and cons, basically, you really seem to be ignoring its pros.