To get the seret "Mini-Cab" truck, buy all the cars for sale (about 140). Then select Car File while in Championship mode and leave the menu screen.
If your car is oversteering too easy, or jumps into the sidewalls even without you touching the controls, then this simple modification will help you out. Set your rear tires to soft tires, and your front tires to medium tires. This along with proper suspension tweaks will help keep your car on track.
Successfully complete each of the official races and event races to unlock the first ending sequence and WSK Races. The WSK Races are the Front Drive Car Cup, Rear Drive Car Cup and 4 Wheel Drive Car Cup.
Note: This trick requires two VMUs. Save the game on both VMUs. Send the cars your acquired from one VMU to the other VMU. Load the game from the VMU with the extra cars. Sell the extra cars for easy money. Repeat as much as desired to have an unlimited amount of money.
If you were looking for Sega GT for Dreamcast cheats, then you might also want cheats for: