Cars in Beach Buggy Racing 2 get faster as your player level increases. When you're Level 5, the cars are a lot faster than they were when you were Level 1. Each time you level up, the speeds and stats of all the cars increase.
Every car in Beach Buggy Racing 2 is balanced to be a fair match for the other cars at the same level, but each car has its strengths and weaknesses. Experiment to find the right match for your character and your Powerup deck!
Note that when you win more, you get matched against players who have higher levels than you. That means their cars are faster, and you need to rely upon your powerups and skills to get an advantage.