DLC will not be released for the Xbox 360 version of Forza Horizon 2, developer Turn 10 Studios has announced.
Credits and cars earned through the Forza Rewards scheme will also not be redeemable.
"I've seen a lot of questions from community members about certain features and functionality on the Xbox 360 version of the game," community manager Brian Ekberg wrote in a post on the Forza franchise's official forum.
"To clarify: We are currently planning to release DLC only for the Xbox One version of Forza Horizon 2. Also, Forza Rewards benefits are only available in the Xbox One version of Forza Horizon 2. This means that Xbox 360 players will not receive Forza Rewards credits or cars.
"In addition, progress in the 360 version of Forza Horizon 2 does not count towards your Forza Rewards Tier Level score. Only progress in the Xbox One version of Forza Horizon 2 will count towards your overall Forza Score (and Tier Level) in Forza Rewards."
The Xbox 360 version of Forza Horizon 2 was released in the UK last week alongside the main Xbox One edition - although this is the first time that Turn 10 has clarified its DLC plans for the former.
Xbox One players get six monthly add-ons via the game's Car Pass, the first of which has just been announced.
Overall there are a number of differences between the game's two versions - as detailed by Digital Foundry in the Forza Horizon 2 face-off. Apart from the graphical changes needed to port the game to Xbox 360, the version for Microsoft's last-gen hardware also lacks many of the online features, including Drivatar integration.
"The overall impression is that Sumo hasn't exactly ported Forza Horizon 2 from Xbox One to the 360, but rather that it has produced its own companion piece that is better suited to the hardware limitations of the older console," Digital Foundry editor Richard Leadbetter wrote.