Enter a "Hot Lap" trial in any chapter, a trial in which you only need to beat a lap time, not one of the average times. Start the race, then on the first lap, get the time needed. You now have passed the stage, but do not end the second lap. Find a good, straight portion of road. You get Kudos for turning with the handbrake. Go to one side of the road as fast as you can. As you are approaching, do a 180 degrees turn using the handbrake. If done correctly, the words "Wey Hey" should appear on the screen. Next, drive the way you are facing to the other side and do the same. When moving the wrong way, you need to spin 180 degrees in order to get the Kudos. Just keep repeating this, then finish the race. For every five minutes that you do this, you will get approximately 1000 Kudos. There is no time limit. The best city for doing this trick is San Francisco, as it has wide roads. Play jokers to get more points -- if you do this for 20 minutes with a joker, you can get more than 8000 Kudos in just one race.
Complete Quest mode once to unlock the Honda S2000.
Complete Quest mode twice to unlock the Porsche 911.
Get All Cars
From the Title screen, press A, X, Y and R at the same time to unlock all cars (they will appear in your saved game).
Free Roam mode
Beat all One on One Challenges in Chapter 25 to get Free Roam Mode for each area of the 3 cities.
Adjust Camera Cheat
Complete the Special Stage in Chapter 8.
Complete the Special Stage in the last event in Chapter 6.
Complete the Special Stage in the 9th event in the Chapter 1.
Unlocking Chapter Cars
You need to complete the following chapters to unlock the following cars:
Chapter 1: Opel Astra
Chapter 2: Renault Megane
Chapter 3: Alfa Romeo Spider
Chapter 4: Peugeot 206
Chapter 5: Peogeot 406 Coupe
Chapter 6: Toyota MR2
Chapter 7: Peogeot 306
Chapter 8: Mercedes-Benz SLK 230
Chapter 9: Alfa Romeo 156
Chapter 10: Audi S3
Chapter 11: Alfa Romeo GTV
Chapter 12: Audi TT Coupe
Chapter 13: Toyota Celica'99
Chapter 14: Fiat Coupe
Chapter 15: Mitsubishi FTO
Chapter 16: Mitsubishi Eclipse Coupe/Spyder
Chapter 17: Opel Speedster/Vauxhall VX220
Chapter 18: Mitsubishi 3000 GT/GTO
Chapter 19: Toyota Supra
Chapter 20: Nissan Fiarlady Z Coupe/Convertable/300ZX
Chapter 21: Nissan Sylvia/Sylvia Varietta
Chapter 22: Ranault Clio 24V
Chapter 23: Mazda RX7
Chapter 24: Mitsubishi Lancer Evolution VI
Chapter 25: Nissan Skyline GTR