The first Grid Autosport DLC comes in the form of the progression speeding 'Boost Pack'.
According to the Xbox Live description, the £2.39/$2.99 download accelerates progression in both career and online modes.
"Gain a boost of approximately 50% more XP in career mode and around 50% more XP, Vehicle XP and in-game Cash when you race online."
The Boost Pack wasn't mentioned when Codemasters outlined its Grid Autosport DLC plans ahead of the game's June release on PC, PS3 and Xbox 360.
At the time, Codies community manager Ben Walke wrote in a blog post that DLC will arrive in the form of a number of themed mini-expansions and car packs. The former will each include a selection of new locations, with some also offering new cars and game modes.
A £23.99/$29.99 DLC season pass available on PC and PS3 will offer access to eight content packs.
In our Grid Autosport review we said Codemasters' latest is "one of the outgoing generation's best racers and the kind of game that makes you wish for a new-gen port".