It seems that the normal Need For Speed Most Wanted edition (for PC) has some features hidden.
When these features are enabled, the normal game looks like Need For Speed Most Wanted Black Edition. So if you bought the normal game and you want to play it like Black edition (with all the features enabled) then this guide is for you.
The conversion is very simple. Just download the attached file and unpack it into EA GAMES\Need for Speed Most Wanted dir and overwrite if needed.
Now start the game and from now your normal version of the game is fully like the BLACK EDITION.