FlatOut: Ultimate Carnage for PC does not natively support split-screen racing, you can enable local multiplayer using third-party mods or specific workarounds often found in community "repacks". The official PC version only includes a turn-based "Party Mode" for stunt events. Key Features of "Split Screen" PC Repacks
Many repack listings claim:
: This tool allows for local multiplayer by opening multiple instances of the game and "snapping" them to different parts of the screen, effectively creating a split-screen environment for games that don't support it natively. flatout ultimate carnage split screen pc repack