Successfully complete the first Tonya Strangers and Freaks mission "Pulling Favors", just outside Franklin's aunt's house. The Imponte Duke O'Death car will appear in a random event at the parking lot of the cafe on the south road across Sandy Shores in the Grand Senora Desert. The cafe can be found just below the airstrip. After stealing the Imponte Duke O'Death, you will be chased by gunmen in several cargo trucks and other smaller vehicles. Either eliminate them or escape the pursuit. Note: You can try driving on the train tracks and entering the railroad tunnels to lose the pursuers. After storing it in your garage, it will also spawn next to the oil derricks west of the airstrip at the Grand Senora Desert and in the scrap yard at the southwest corner in El Burro Heights. Additionally, the Imponte Duke O'Death is exclusive to the PC, PS4, and Xbox One versions of GTA 5.