If you pause for several seconds at the start of a Freestyle race to allow the power-ups to regenerate you will be able to collect ALL of them.
Unlock Alternate ATV Shells
Finish in first place in ALL of the events in the tenth stage to successfully complete World Tour mode and unlock alternate ATV shells for each character.
The following procedure involves editing a game file so it is advised that you create a backup copy of the file before proceeding. Use a text editor to edit the 'DefaultTuning.params' file in the 'DataVehiclesHandlingTuning' directory in the game folder changing the values of the 'StatModifier' and 'StatBase' entries to the maximum
Unlock Brett Taylor
This hidden character becomes unlocked when you have completed ALL the events in World Tour