Faster Mercedes:
Enter "Reki" as a name (case-sensitive).

360 Spider and 360 Modena:
Win the Kudos Challenge level 9.

911 GT2:
Win the Kudos Challenge level 12.

Aston Marton V12 Vanquish:
Win Arcade Race level four.

Boxster S:
Win the Kudos Challenge level 2.

Camaro SS:
Win all golds in Quick Race level two.

Carrera GT:
Get 150,000 kudos.

Corvette ZO6:
Win the Kudos Challenge level 7.

Delfino Feroce:
Get 75,000 kudos.

F355 Spider and 355F1:
Win all golds in Quick Race level four.

Ferrari F50:
Get 200,000 kudos.

Focus Cosworth:
Win the Kudos Challenge level 3.

Lancer Evolution VII:
Win all golds in Quick Race level three.

Lotus Exige:
Get 50,000 kudos.

Opel Speedster:
Win Arcade Race level two.

Panoz Esperante:
Get 25,000 kudos.

RX-8:
Win Arcade Race level one.

Skyline GTR:
Win the Kudos Challenge level 5.

Subaru WRX:
Win Arcade Race level three.

TT Roadster and TT Coupe:
Win all golds in Quick Race level one.

TVR Tuscan Speed Six:
Get 100,000 kudos.

Viper RT-10:
Win the Kudos Challenge level 11.

VW Beetle RSi:
Get 1000 kudos on the easy difficulty setting.

Z3 Roadster 3.0i:
Win the Kudos Challenge level 1.

Bonus time trial tracks:
Accumulate over three and four hours of game play to unlock more tracks in time trial mode.

Free roam in time attack mode:
Win a silver or gold medal in all parts of kudos challenge mode for a city. Select time attack mode and a "Free Roam" option will be unlocked for that city.

Bonus helmets:
For every hour of game play you will receive a new helmet for your racer.

Medal pursuit paint jobs:
Accumulate five hours of game play to unlock medal pursuit paint jobs.