Corvette

Cheat:

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In the options menu, enter the following as your name:
XOPENSEZ - Unlock all courses

Custom corvette mode:

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Win all races in C3 career mode

Unlock Everything:

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Go to options and go to "change name" and put "xopensez".

Route 66 Checkpoint Mode:

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Win all C5 career mode races to unlock this race mode.

Circuit Endurance Mode:

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Win all the C4 career mode races to unlock this race mode.

Hot Lap Challenge Mode:

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Win all the C2 career mode races to unlock this race mode.

Custom Corvette Mode:

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To get custom corvette mode, you have to win all the races in C3 career mode.