You need to know this DLC is a totally optional cash grab by the devs. You get 2 new possibly overpowered cars selectable immediately in all game types including story mode, and a new map for slaughter mode. Both of these cars are fun as hell to drive, especially in slaughter mode. The Auroch has the highest ramming in the game by far and rolls through packs of zombies like a hot knife through warm butter. The monster truck, Chaos 126p, has obscenely good acceleration and turning and is quite fun once you get used to it. You also get 'military base', a fairly open medium sized arena map for slaughter mode. If you've played through this game and still find yourself coming back for more, pick this DLC up during a sale.