For the Trial.
Nissan Titan Warrior Concept 2016
SC: Design 420 438 477 - Tune 599 531 245 (C 600)
You can find some more cars and tunes here.
For the Shelby championship.
Shelby Cobra Daytone Coupe 1965
SC: Design 144 361 545 - Tune 102 381 750 (S1 900)