Unlock all Tracks and Cars in Arcade Mode:
Enter "PING" at the code section to activate the cheat.
Unlimited Cash for Career Mode:
Enter "FAST" at the code section to activate the cheat.
Easy Money:
In career mode, go to your garage and do something with one of your cars for example, switch a part or get a different paint job. The game should autosave. Then, go back to your race menu. Go in a sprint and bet all your money on one car that looks the fastest. It it does not win at least three races out of four, turn off the Xbox and turn it back on. It will load your last autosave. Try the same sprint again until you win then find a different sprint and start the entire process again.
All prototype parts for all cars:
Complete the game with 100 respect from all computer players.
Avoiding pink slip without loosing respect:
When someone call you for a pink slip race accept it and then a map will show go to the race select car and press go then will show menu with your car and opponent car. Simply press B and comunicate will show "Leave event and finish last" accept it and you won't loose respect and your car.
Bouncing car:
Get a Corvette Z06 and go to the test track. Start driving backwards, then go to the curb with the crane sticking over the track and drive into the dirt. You should see hardened dirt. Drive onto that until you get halfway through the hardened dirt, then drive off slowly as if you are going back onto the track. Before you get back on the track your car should start to bounce and shake. When you come out of it, your car should be badly damaged.
Flying car:
Get a Viper GTS fully tuned and go to the oval track. Drive about 210 mph. When you are about to turn, turn the other way into the wall. Hit the nitrous and hold it while still turning into the wall. If done correctly, your car should go up and fly. You must be in the dirt part of the turn. Try using the nitrous two seconds before hitting the wall and hit the wall wire fence at about a 30 degree angle.
Free metallic paint:
Go to the paint menu in career mode in the workshop. Highlight "Metallic" and press A. At the color selection screen, press Y. Go to the base color and chose one. The original base color will now be active as a metallic color. For example, if the original base coat is red, if you highlight black as the base color the car will appear as black with a red metallic coat. This does not work if the car has been repainted already.