You will have to upgrade your kart if you want to go head to head with stronger opponents. Every kart has a CC rating that represents how fast/powerful it is. You can see your kart’s current CC at the top of the screen after choosing an episode. Each time you upgrade your kart, the CC will increase. To upgrade your kart in exchange for coins, tap the green + button next to you current kart’s specs. Once your CC reaches the level required, put the pedal to the metal and head back to the Champion Chase to challenge your opponent again!