Start the game using any of the following command-line parameters to activate the corresponding cheat. You can do this by modifying the shortcut (icon) to your game.
Example: "C:\Program Files\Need For Speed Hot Pursuit 2\NfsHS.exe" [parameter]

Code - Result:
+ghost - Car is Transparent to Others
+opentree - Enter Locked Events
+nofrustration - Disables Confirmations
+nomovie - Disables Movie Demos
+nomusic - Disables Music
+nosnd - Disable Sound FX
+noreverb - Disable Reverb
+nofrontend - No Menu
+helicoptersOnly - Cops Only Use Helicopters


Cheat Method
To purchase cars at a cheap price ($10 each), open up the cars.ini file in your CARS folder (from the main NFSHP2 game folder) using Notepad. Change the following lines:

price=10
nfsprice=10

The edit trick can be done to change the price of the tracks as well. Just open tracks.ini in the TRACKS folder and edit all lines starting with 'm_price'.

Example: m_price[0]=10

NOTE: Always make a backup before overwriting game files.