Claim: Adding new single-player and multiplayer modes to the racing video game, Grip Shift's Turbo Expansion Pack was released on February 13, 2008.
Evidence: The "Turbo Expansion Pack" downloadable content was released on February 13, 2008 exclusively for the Xbox 360 version. The content adds new single-player and multiplayer modes, eight Race Tracks, eight Deathmatch Arenas, and eighteen new music tracks. GripShift is a racing video game.