Different gang cars?

I don't know much about modding at all, but do have a background in game development, so I'm not a dummy, haha. But if anyone could show me how to go about changing the gang cars to something like police/swat vehicles it would be greatly appreciated.

Also, I don't suppose theres a mod to make the Saints more prominent? I never see any Saints in cars, only walking around and I have 100% of the map taken over.
 
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