https://www.youtube.com/watch?v=irlhPGbqCEA
Thats were for test only
client and server side. Looks like "Twisted metal MOD" ( where any vehicle can shoot ) are very possible to be created. Just imagine map where many fast vehicles what can shoot (not horn only) race and fight! I know it is possible to spawn only 16 cobras and 16 humvees by replacing other vehicles 