Win all the A Class events to unlock the Quick Tune options, which allow you to adjust the weight of your car, horsepower, aerodynamics, gearing, and other settings.
Successfully complete the main A, B, and C Class events with a "Bronze Medal" or higher rank to unlock the S Class events.
Successfully complete the indicated task to unlock the corresponding car:
It is recommended you do the following events in the indicated order:
Note: In the S Class events, Quick Tune your cars before each race. If your car is above the point limit, drop the horsepower to meet the point requirement for the race. If your car is below the point limit, drop your weight and raise your horsepower to match the point limit. There is no reason to drive a car below the point limit unless you really want to challenge yourself.