From the Super Mario Wiki
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According to the in-game stats, the Koopa King is the fastest kart in the game, as well as having the weakest acceleration, making it a bad pick for simple courses, such as Baby Park. It is also one of the heaviest karts in the game; its weight is tied with the Piranha Pipes and Boo Pipes. The Koopa King shares its engine sound with the DK Jumbo, Barrel Train, and Parade Kart.
In terms of its actual stats, the Koopa King does offer the highest top speed and the lowest acceleration of all the karts in the game, but it's also tied with the Bullet Blaster for losing the most speed whenever it goes off-road.
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