Big Headed Racers
Racers that can be seen in the game, such as those on bikes and ATVs, will have big heads when you enter this cheat. Pause your game. Push the analog sticks down and to the right while pressing and holding "L1," "L2," "R1," "R2" and "R3." Now push the analog sticks down and to the left while pressing "L3." You will hear a chime if you activate the cheat correctly.
Unlock Content &Mirror Mode
You can also use a cheat to unlock all of the content in the game, from tracks to racers. While at the main menu press in the analog sticks and push them up while also pressing and holding "R1," "R2," "R3," "L1" and "L2." Now push the analog sticks down and press "R3." To unlock mirror mode, which will flip the courses, press in and hold the analog sticks to the right on the main menu while pressing and holding "L1," "L2," "R1" "R2" and "R3." Then push the analog sticks to the left and press "R3."
Consistent Boost
If you hold the "X" button to boost, you will increase the boost meter and run out of the accelerant. Instead, press the "X" button rapidly. This will give you a more consistent speed through the course, especially with lighter vehicles.
Better View
The off-road can be really bad on a windshield, as your glass will become covered with dust or mud over time. The best way to eliminate this problem is with a camera change trick. Hit the "Triangle" button to switch your view to a close first-person view and then quickly hit that button a second time to switch back to your original view. The debris on your windshield will disappear.