The engine enhances the overall high speed of a car. They often increase in high speed increments. High speed performance is most noticeable on the straights of an area. During the story, the high speed performance of enemies becomes high. To counter this and not get overtaken, it is essential to enhance engines to a higher grade.
Engines can be acquired from the Daily Engine Event; you can only acquire up to Grade 11 from the Extreme category.
Parts are obtained from Story rewards, CP Orders, Gold Orders and Order Tickets. It is also possible to obtain these parts from the 24 Hour Part Races