Koei today announced that a demo for Fatal Inertia is now available from the Xbox Live Marketplace for the Xbox 360 owners. The demo offers single player and split-screen two-player Combat races, as well as high-speed Velocity races from the game's Exhibition and Elite racing leagues. The game ships on September 11th with over 1.3 million race craft customization combinations plus 15,000 performance combinations and 51 courses across 6 distinct racing environments.