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OKAY 1ST OFF I'M SORRY IF THIS HAS ALREADY BEEN POSTED BUT I JUST FOUND THIS OUT AND HAVEN'T SEEN THIS ANYWHERE.
Step 1: Get a car you want to dupe with some one it can be any car and can be fully upgraded.
(YOU CAN NOT DO THIS WITH HIGH CLASS SUPER CARS!)
Step 2: Start a Job with your friend preferably a Gerald mission the ones where you deliver dope to him.
Step 3: Play through the mission but do not complete the mission yet.
Step 4: Tell your friend to Drive your personal vehicle (THE ONE YOUR GONNA DUPE) and tell him to drive pretty far away from the mission end blip on the map so he will not be in the cutscene.
Step 5: Tell your friend to stay in the car while you finish the mission then once you get to the leaderboard screen/voting screen vote for Free Roam.
Step 6: When you and your friend spawn back in free roam your car should still be on the map and he should still be in the one you gave him in the mission.
Final Step: Now that you and your friend have the car tell him to drive to Los Santos Customs and put a Tracker and Insurance on the Car.[/FONT]
AND THERE YOU GO YOU HAVE SUCCESSFULLY DUPLICATED YOUR CAR.