Cheat option:
Begin game play in one player championship mode on the Coventry Cove track. Locate 
the shortcut near the barn with two haystacks. Intentionally drive into the haystack 
closest to the track and hit the Daisy Box hidden inside. The word "Groovy" will 
confirm correct trick entry. Successfully complete the race. A "Cheats" selection 
will now appear on the options screen. 

Novice level bonus cars:
Successfully complete Novice tracks to unlock a racing striped HSV, the #8 HSV, and 
the Lightning HSV. 

Advanced level bonus cars:
Successfully complete Advanced tracks to unlock the #8 HSV with a spoiler, the 
Lightning HSV with a spoiler, and the Flower HSV. 

Alien HSV:
Successfully complete the Professional Championship. 

Police HSV:
Successfully complete all the standard Championships to unlock a bonus mode. 
Complete bonus mode to unlock the Police HSV. Hold C-Left while driving that car to 
turn on the siren. This will cause the other racers to slow and stop. 

Quick start:
Quickly press L when "Go" appears at the start of the race. When done correctly, 
your car will begin the race at over 40 mph.