Game crashed? You die.
Server lag? You die.
Network glitch? You die.
Hit a small immovable object at speed? You die.
Take off a wheel, and the car takes off? You die.
You die, you die, you die.
But please fix duping first. Give each item a UID in instantiation. If the server seems two items with the same id, nerf them both. Job done. No more excuses Bohemia - unlike the cars where it already seems to have been badly applied, this isn't rocket science.