Fusion

Fusion: Destroy two cars of the same Level to create a new, higher-Level car that combines Stats from both. The higher the Level of the cars used in Fusion, the more Stats can carry over. Before confirming, you’ll see an estimated preview of the new car’s Stats and Top Tracks, with a small chance of slight variation in the final result. This new car is one Level higher and unlocks access to more tracks, visible Stats, and greater reward potential.

Cars with active Tune-Ups can permanently lock in those optimizations through Fusion, resulting in highly specialized cars built for specific tracks.