Complete the indicated Hot Car event during Career mode to unlock it and its corresponding car in Quick Play mode.

The Stunt and Ford GT: Complete "The Stunt" event in Career mode.
Deep Water and Mazda RX-8: Complete the "Deep Water" event in Career mode.
Drawbridge and Porsche 911 GT2: Complete the "Drawbridge" event in Career mode.
Decoy and Mercedes-Benz SL65 AMG: Complete the "Decoy" event in Career mode.
Versus and Dodge Viper SRT-10: Complete the "Versus" event in Career mode.
Redline and Lamborghini Gallardo: Complete the "Redline" event in Career mode.
Hornet's Nest and Aston Martin DB9: Complete the "Hornet's Nest" event in Career mode.
Betrayed and Porsche 911 GT2: Complete the "Betrayed" event in Career mode.