Automobiles have entered the world of Equestria, sparking enthusiasm in the hearts of creatures all across the land, and even monsters see racing and tuning as a fun pastime. While car culture is a great source of friendship, bitterness arises as adversaries set out to finish their rivals on a motoring circuit, as there is always somepony to take an enjoyable hobby and blow it out of proportion.
The synopsis confuses me. What is the basic plot of this story?