So there's no other way to install a car mod without replacing the original, except if it is an add-on

So I found some really great cars, but as I know, It is only possible to install them by replacing the cars in the game, but maybe there is another way, that wouldn't replace the whole car? For people who did not understood my question, I'm not talking about how to use mods folder, I want to install the car mod, without completely removing the original car, so that both cars would spawn, for example, If i found a mod which replaces Coil Voltic with, let's say a Tesla car, is there a way to install the mod, so that i could drive Coil Voltic, and the Tesla car?