In Career mode complete the following 'Hot Car' events to unlock the corresponding upgraded car in 'Quick Play' mode.

Unlock The Stunt (Ford GT):
In Career mode complete 'The Stunt'.

Unlock Deep Water (Mazda RX-8):
In Career mode complete 'Deep Water'.

Unlock Drawbridge (Porsche 911 GT2):
In Career mode complete 'Drawbridge'.

Unlock Decoy (Mercedes-Benz SL65 AMG):
In Career mode complete 'Decoy'.

Unlock Versus (Dodge Viper SRT-10):
In Career mode complete 'Versus'.

Unlock Redline (Lamborghini Gallardo):
In Career mode complete 'Redline'.

Unlock Hornet's Nest (Aston Martin DB9):
In Career mode complete 'Hornet's Nest'.

Unlock Betrayed (Porsche 911 GT2):
In Career mode complete 'Betrayed'.

The following cars become unlocked when you earn the indicated number of Bounty Points in Career mode.

Unlock Aston Martin DB9:
Earn 690,000 Bounty Points.

Unlock BMW M3 E92:
Earn 690,000 Bounty Points.

Unlock Chrysler 300C:
Earn 95,000 Bounty Points.

Unlock Dodge Charger SRT-8:
Earn 95,000 Bounty Points.

Unlock Dodge Viper SRT-10:
Earn 500,500 Bounty Points.

Unlock Ford Mustang (1967):
Earn 12,000 Bounty Points.

Unlock Ford Mustang GT:
Earn 95,000 Bounty Points.

Unlock Lotus Elise:
Earn 134,500 Bounty Points.

Unlock Mazda RX-7:
Earn 134,500 Bounty Points.

Unlock Mazda RX-8:
Earn 42,500 Bounty Points.

Unlock Mercedes-Benz SL65 AMG:
Earn 500,500 Bounty Points.

Unlock Mitsubishi Lancer Evolution IX:
Earn 370,000 Bounty Points.

Unlock Mitsubishi Lancer Evolution X:
Earn 500,500 Bounty Points.

Unlock Nissan 350Z (Z33):
Earn 283,000 Bounty Points.

Unlock Nissan 370Z (Z34):
Earn 690,000 Bounty Points.

Unlock Nissan Skyline GT-R (R34):
Earn 370,000 Bounty Points.

Unlock Pontiac Solstice GXP:
Earn 12,000 Bounty Points.

Unlock Porsche Cayman S:
Earn 283,000 Bounty Points.

Unlock Toyota Supra:
Earn 134,500 Bounty Points.

Unlock Volkswagen Golf GTi:
Earn 42,500 Bounty Points.