The Duggan Robbery is one of the five Salvage Yard Heists in GTA Online, and you can use it to make a decent chunk of change. To get started with these robberies, you will need to first set up a Salvage Yard business with brothers Yusuf and Jamal Amir. Of the total five such robberies or heists available, only three can be done each week. The target car changes as well, and you can choose to either salvage it or sell it to Yusuf.