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@Hellcat_1 Hi, the problem is the gameconfig file in openIV. You have to download the modded gameconfig file for your version of GTA V and replace the original one with the moded one in the OpenIV.

Basically the original gameconfig file does not allow you to add card mods in the game, while the modded gameconfig file allows you to add multiple car mods in the game.

You can go to gta5-mods.com and search for "gameconfig" in the search bar and download the first one. Then open the folder and choose the gameconfig file that matches your version of GTA V. And then replace it with the original one like I told you above.

That's it. Done !!!