How to install:

Download CarEditor:http://nfsa.ca/f7201

If you have NFS2:
Unzip downloaded cars.
Load one of them into CarEditor.
Select "File->NFS2 Save As".
Go into "your Need For Speed 2 path"/GameData/CarModel/PC directory.
Choose one of the cars (i.e ff50.geo for Ferrari F50) and press save.
If you have overwritten Ferrari F50, then start the game and select Ferrari F50.

If you have NFS2 SE:
Unzip downloaded cars.
Load one of them into CarEditor.
Select "File->NFS2SE Save".
Input path of NFS2SE (usually C:\Need For Speed II SE\)
Press "Apply" button.
Now select one of the racing cars and press save (i.e. ff50.geo for Ferrari F50)
If you have overwritten Ferrari F50, then start the game and select Ferrari F50.