RalliSport Challenge 2

Use car from different class:
This trick allows to use a car from one class (for example, Hill Climb) while racing
in a different class. It can only be done online, and you must be the host of the
game. Start your game with the game type that you want to race in (for example,
Rally). Then, go to the game settings screen and select the class of the car you
wish to use (for example, Hill Climb). Then, press B to exit back to the lobby.
Then, go to car selection screen and you may choose a Hill Climb car in a Rally
race. Note: Hill Climbs are much faster.

Honk:
Click the right thumbstick, you can barely hear it but it works.

Any player get any car online and lap times still count:
Select where you want to go, then choose the track. After you do that, turn Xbox
rules off and proceed. After everybody gets their cars, go back through the
process. However, instead of pressing A to continue after you change Xbox Rules
back on, press B all the way back to the lobby. Then, start the race, but make
sure that their car does not change. This works about 99% of the time.