WARNING!!!!!!    DON'T FORGET TO BACKUP ALL FILES YOU ARE ABOUT TO CHANGE/REPLACE!!!!!!!

2 versions because 2 cavalcade versions in game




Open "vehicles.img" with Spark IV      "...\Rockstar Games\Grand Theft auto IV\pc\models\cdimages\vehicles.img"     

search "fbi.wtd" and replace the existing file with the new "fbi.wtd" 
press "save", play the game, have fun