How to make a speed boost for a car

So I am currently making a racing game, and I want the player to be able to obtain speed boosts during the race. The problem is, however, that I don’t know for sure how to do this. The cars you start out the game with is the default Roblox jeeps that I customized.

I want this boost:
to make the vehicle speed up when touched. I don’t know if the cars being not my own will make it harder or not, but I’m not sure. If you think you know what to do, please let me know. Have a great day!

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Can someone please help me figure out how to do this? Any help is appreciated!