Full pause screen
As with most other Dreamcast games, hit X+Y at the pause screen to remove the menus from view.

Jackpot Cheat
After finishing a race in Championship mode, save your game in case a you get to try for the jackpot. If you don't win it on the first try, simply reload your game in the options menu and keep trying until you win. Submitted by Blade

Three new trucks
Complete championship, arcade, and indoor modes to unlock one new truck for each game mode completed.