Board Thread:Game Discussion/@comment-2600:1004:B100:9807:F1B0:12B9:E961:D319-20180516125102/@comment-26829117-20180517070655

In fact, the following are the flashback minimum win prices from the originals:
 * Born for Victory - 0 to win McLAREN P1™ GTR, 40 reward
 * Relentless - 204 to win McLAREN 720S COUPE, 90 reward
 * Rennsport Redefined - 295 to win PORSCHE 911 RSR (2017), 100 reward

So 499 gets you all the flashback cars with a total reward of 230 making a net cost of 269. Not that bad really.