After examining it further it is trying to pull parameters off s105_rally.et that don't exist on vanilla prefab

It's like you are circumventing the non-existent dlc with this version, but it throws errors that can stack upon every spawn of said vehicle

It is a very bad way to bypass dlc ownership, because this car should be as 105 base as parameters, not what you made it likely sharing parameters of an actual dlc vehicle, you should not create stackable errors like this