You haven't been really clear with what said, without specify that the game crashes without show any message right because of the addon_vehtypes.ar file that you edit.
Maybe you do something wrong with editing the .csv file? To be sure to do the things correctly, download the most updated addon_vehtypes.ar file
here and put it in the game folder together with your cop car, then, download
this tool, run it, open the .ar file and add the basename of your cop car, and finally save. Check all running the game.
Never remove the "!" symbols, and delete any other .ar file of this kind that you may have in the game folder.