To upgrade your car in Drift Hunters, you need to do some basic steps. First, you need to earn points by drifting and completing missions in the game. The higher your score, the more opportunities you have to upgrade your car. Once you have accumulated enough points, go to the upgrade menu in your garage, select the car you want to upgrade.

Once you have selected your car, you will see various upgrade options such as engine, suspension, tires, brakes, and weight reduction. Each upgrade will improve the performance and drifting ability of your car. After purchasing the upgrades, test your car on the road to feel the difference. Remember that upgrading is a continuous process, so practice regularly to earn more points and upgrade your car!