When you win a certain amount of races you will be rewarded with the following licenses.

Unlock D License:
Win 2 races.

Unlock C License:
Win 7 races.

Unlock B License:
Win 16 races.

Unlock A License:
Win 26 races.

Unlock Burnout Paradise License:
Win 45 races.

Unlock Burnout Elite License:
Win ALL 110 races.

Complete the indicated Online or Offline tasks to unlock the corresponding Carbon car in the game.

Unlock Uberschall:
Beat 2 sets of the Online Challenges.

Unlock Iskusa GT:
Beat ALL Offline Times on the 64 Roads.

Unlock Hydros Custom:
Beat ALL Offline Showtimes on the 64 Roads.

To unlock these great bonus cars in the game you must first complete the indicated task.

Unlock Jansen Carbon X12:
Land ALL 50 Superjumps.

Unlock Montgomery Carbon Hawker:
Hit ALL 120 Billboards.

Unlock Carson Carbon GT Concept:
Find ALL 400 Smashes.

Unlock Hunter Mesquite:
Get a D license.

Unlock Nakamura SI-7:
Get a C license.

Unlock Carson Fastback:
Get a B license.

Unlock Rossolini Tempesta:
Get an A license.

This GT bonus car is unlocked by going to the 'Under The Hood' menu and entering the code 'Q83E 3H1S BI3B 40P4' (without the quotes).

If you have at least a Class A license you can enter the following passwords without the quotes as a Profile to unlock the corresponding car.

Unlock Best Buy Car:
Enter the password 'BESTBUY' as a Profile.

Unlock Circuit City Car:
Enter the password 'CIRCUITCITY' as a Profile.

Unlock Gamestop Car:
Enter the password 'GAMESTOP' as a Profile.

Unlock Wal-Mart Car:
Enter the password 'WALMART' as a Profile.