Switch to the chase view to see the rear of your vehicle and make sure the camera is not locked. Hold L1 and diagonally press Right Analog-stick Up/Left to Down/Right.
Disable vehicle collisions
To disable vehicle collisions, head to the in-game cheats menu and insert the code GHOST.
Various Codes
Select "Options" at the main menu. Select the "Cheat Codes" option. Enter one of the following codes to activate the corresponding cheat function.
All vehicles and tracks
Enter SHOWTIME as a code.
Truck with all performance parts
Enter SUPERMAX as a code.
Zoomed view
Switch to the chase view to see the rear of your vehicle and make sure the camera is not locked. Hold L1 and press Right Analog-stick Up or Down to adjust the zoom.