Level select
Press X, B(2), X, L(2), Y, Up, Down, Right, Up at the "Cheats" screen.

Hint: 360 powerslide
This trick is tough to pull off and will require some practice before using it in a race. Get to at least 80 mph. Press the Analog-stick backwards at an angle in the direction that you want to turn, so it is inverting your slide. As soon as you begin to turn, slam and hold the brakes. Force the Analog-stick sequentially around in an extreme circle. Release your brakes when you are about 75% through your turn. Slam your accelerator, and power yourself through the rest of the turn. At the end, it is recommended that you bank the car for a moment, because you do not want the it to fly out of control.

Hint: Get the police off your tail
If you have one or two police chasing you, swerve around things such as incoming traffic, trees, poles, or any other immobilized objects. The police may not see it and crash into it. This gives you an advantage to lose them. If you are way ahead of the pack and do not feel like having a police on your tail, if your radar detector detects an incoming radar (or police), zoom on the road in front of you. See where the police are parked, and slam into the back of their car. It will be a hit and run, but the police car will be dead. You will not even get a yellow star.

When you want to get rid of the cop chasing you at a close distance, get just behind him so that your front tire is touching his back tire. Then, turn your car slightly in the direction of the cop car. The officer will get turned around and end up facing in the wrong direction. This should give you enough time to get away. If you are really lucky, he may hit the other racers and cause a big accident.

If you are cornered, press Reset Car to start back on the road and lose the cops.

Use the following trick to easily escape from police radar. When you get close to a cop, stay on the correct side of the road and drive 80 mph at the most.

Dodge Viper GTS
Get 2 million points to unlock the NFS edition of the Dodge Viper GTS.

Ferrari F50
Lead a single race, full grid, advanced, for eight laps to unlock the NFS edition of the Ferrari F50.

Lamborgini Diablo 6.0 VT
Get 2.5 million points to unlock the NFS edition of the Lamborghini Diablo.

Lamborghini Murcielago
Get 3 million points to unlock the NFS edition of the Lamborghini Murcielago.

McLaren F1 LM
Win the World Championship to unlock the NFS edition of the McLaren F1 LM.

Extra points
If you see a police car ahead, ram it to get him to chase you. Lose the police car and you will get extra points for a hit-and-run. Look for the dirt road shortcuts to lose the police and get ahead of other drivers. Also, choose to be the police in Hot Pursuit mode. You will get 25,000 points each time you complete one mini-mission