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Can this be bought on the website in the game, or do you need to use some plugins to modify it?

I have always had a question to ask, if the module is added to the game, can the car in the module be bought on the mobile phone of the game, or do you need to use a mod to modify it, or replace the car in the game?

Does this need to be added to the file, or does it need to replace the file?