This is an open source version of my kart physics system originally sold on the Unity Asset Store, tested in Unity versions from 2019.4.0f1 to 2022.x. You can also download a Unity package of the last version published to the Asset Store here. Everything except the Assets/Packages folder is licensed under the MIT License.
Other branches feature unfinished race and battle mode features that I don't plan on completing.
Watch on YouTube.
See the Manual.