First of all don't post in capitals
You can't use new cars with an existing mod without a good knowledge of how csm works.
If you want to install cars, use a .wad program (e.g. easywad which comes with zaz tools) to put the car files in the wad -
make sure if you haven't already to read the FAQ stickied at the top of the page, it will give you answers to most of your questions (including that one)
Anyway, welcome to the game
Batracer - the online racing manager game - join here
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batracer.com]