Successfully complete the indicated task to unlock the corresponding car:

Assassin Coupe: Get 60 Takedowns.
Coupe Cop: Win the Gold medal at the Vineyard or Palm Bay Pursuit.
Custom Coupe: Win the Gold medal at the Riviera Race.
Dominator Coupe: Get 40,000 Burnout Points.
DX Coupe: Win the Gold medal at the Big Surf Shores Eliminator.
Legend Pickup: Win the Gold medal at the Vineyard Legend Face-Off.
Legend Special: Win forty one Gold medals.
Legend SUV: Win the Gold medal at the Airport Legend Face-Off.
Modified Coupe: Win the Gold medal at the Silver Lake Race.