That type cheats on the screen says 'PRESS A KEY'. It May work on main menu too.
Enter the following codes on the screen where the game shows "Click to Continue":
In the retail version For: PC
canyonalltheway = All Tracks (Unlock all tracks)
5grand5grand = Castrol Cash (receives money from sponsors)
shinycarsarethebestcars = Chrome Cars (Cars chrome)
chasingmobile = Corvette Z06 Interceptor in Quick Race Mode (Unlock Corvette Z06 Interceptor in Quick Race Mode)
guesswhoisback = Cross Corvette Z06 in Quick Race Mode (Unlock Cross Corvette Z06 in Quick Race Mode)
watchoutthebigtruckishere = Dump Truck in Quick Race Mode (Unlock the garbage truck in Quick Race Mode)
bigredfiredrive = Firetruck in Quick Race Mode (Unlock Fire Truck in Quick Race Mode)
trashtalking = Rhino in Quick Race Mode
friendlyheadlocksapplied = Unlimited Crew Charge
nosforeverever = Unlimited NOS (Nitro unlimited)
slowitdownwhenyouwant = Unlimited Speedbreaker
inthezoneskin = Autozone Vinyl Unlocked
syntecskin = Castrol Syntec Vinyl Unlocked
cooperlogofreeforyou = Cooper Tire Logo Unlocked
Mazda Speed3 speed3foryou = unlocked
lotsoffreelogos = Need for Speed Carbon Logo Vinyls Unlocked
lotsoffreevinyls = Need for Speed Carbon Special Logo Vinyls Unlocked
pharrellvinylgogo = Pharrell Vinyl Unlocked
chasingheadlocksappliedrashtalk = Mazda Dealership Unlocked
givemethedb9 = 2005 Aston Martin DB9 unlocked
givemethechargersrt8 = 2006 Dodge Charger SRT8 Unlocked
In the demo version:
givemethedb9 = Get an Aston Martin DB9 (only DEMO)
givemethechargersrt8 = Get a Dodge Charger SRT8 (only DEMO)
canyonalltheway = Enable Canyon race (only DEMO)