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Sony PSP - Nascar 07 cheats

Go to main menu, choose the "Game Modes" option, then select 
"Fight To The Top" mode, then enter the following first and 
last names at the driver information. Note: All names are 
case-sensitive.

Unlock every vehicles and drivers in all 4 divisions and 
unlock Old Spice Fantasy circuit:
First name: KeepCool 
Last name: SmellGreat 
    
Unlock Wal-Mart circuit and cars:
First name: Walmart 
Last name: EveryDay 

Unlock all Chase Plates:
First name: ItsAll 
Last name: ForMe

Unlock Level 10 Prestige:
First name: Outta 
Last name: MyWay

Unlock Full team Prestige
First name: MoMoney 
Last name: BlingBling
     
Get $10,000,000:
First name: GiveMe 
Last name: More

Unlock 10,000,000 fans
First name: AllBow 
Last name: ToMe

No Collision mode
First name: Walmart 
Last name: NoCollision
You can toggle this option in the Damage selection in Race Now mode 
and will appear as "Wal-Mart No Collision Mode".