Reach the indicated level in North America to unlock the corresponding car:

1968 Shelby Mustang GT-500KR: Level 5
1969 Dodge Charger R/T-SE: Level 10
1970 Chevrolet Chevelle SS-454: Level 15
1996 Chevrolet Corvette Grand Sport: Level 25
1999 Dodge Viper GTS ACR:Level 30
2000 Ford Mustang Cobra R: Level 20
2002 Cadillac #6 Team Cadillac NorthStar LMP-02: Level 50
2002 Saleen #11 Graham Nash Motorsport S7R: Level 45
2005 Chevrolet #31 Whelen Enigneering Corvette Z06: Level 35
2005 Panoz #51 JML Team Panoz Esperante GTLM: Level 40