Claim: Grip Shift, a racing video game that received average reviews according to Metacritic, released it's Turbo Expansion Pack on February 13, 2008 which added new single-player and multiplayer modes to the game.
Evidence: GripShift is a racing video game. The game received "average" reviews on all platforms according to the review aggregation website Metacritic. 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.