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The cars that you win in the Endurance races are not random. In each Endurance race, there is an enemy car that is different from all the other cars in the race. If you win the race when this car shows up, you win one car. You win the other car, when the different enemy car doesn't show up. Here's a list of every different enemy car in every Endurance race:
Grand Valley: Venturi Atlantique 400 GT
Apricot Hill: Ford GT40
Seattle Circuit: Shelby Series 1
Laguna Seca: Dodge Viper GTS
Rome Circuit: Taisan Viper
Trial Mountain: Vector M12 LM Edition
Special Stage R5: Citroen Xantia
I don't know what car you win in Trial Mountain when the Vector M12 LM Edition shows up, but it's probably a rally car, since there's a rally car won in every other Endurance race.
Grand Valley: With Venturi: Subaru Impreza, without Venturi: R390
Apricot Hill: With GT40: Viper GTSR, without GT40: Stratos
Seattle Circuit: With Series 1: GT90, without Series 1: Escort
Laguna Seca: With Viper GTS: 300GT, without Viper: Celica
Rome Circuit: With Taisan Viper: Corolla, without Taisan Viper: Altrezza
Trial Mountain: Denso Supra (only prize car)
Special Stage R5: With Xantia: Cerbera, without Xantia: Lancer Evolution
Grand Valley: Venturi Atlantique 400 GT
Apricot Hill: Ford GT40
Seattle Circuit: Shelby Series 1
Laguna Seca: Dodge Viper GTS
Rome Circuit: Taisan Viper
Trial Mountain: Vector M12 LM Edition
Special Stage R5: Citroen Xantia
I don't know what car you win in Trial Mountain when the Vector M12 LM Edition shows up, but it's probably a rally car, since there's a rally car won in every other Endurance race.
Grand Valley: With Venturi: Subaru Impreza, without Venturi: R390
Apricot Hill: With GT40: Viper GTSR, without GT40: Stratos
Seattle Circuit: With Series 1: GT90, without Series 1: Escort
Laguna Seca: With Viper GTS: 300GT, without Viper: Celica
Rome Circuit: With Taisan Viper: Corolla, without Taisan Viper: Altrezza
Trial Mountain: Denso Supra (only prize car)
Special Stage R5: With Xantia: Cerbera, without Xantia: Lancer Evolution