Chevrolet Corvette Grand Sport (Enduro Double Down)/Challenges

Tier 1.3
Challenges are now based on Tier 3 and Tier 4 once the player saves up enough points. The Tier 4 Ace Race is used and challenges for the Chevrolet Corvette C7 and 1967 Chevrolet Impala are now replaced by the Chevrolet 2016 Camaro SS and 9FF GT9 VMAX