These are the Forza Motorsport 5 Hot Wheels Car Pack DLC ones. The cars are as follow:
2015 Audi S3 Sedan
1939 Audi Auto Union Type D
1952 Ferrari 375
1973 Ford XB Falcon GT
1956 Ford F-100
1983 GMC Vandura G-1500
2013 Lamborghini Veneno
1967 Lotus Type 49
2013 Mazda #7 Andretti Autosport USF2000
1974 Toyota Celica GT
