For Xbox:

Even if you avoid a ban, using rare cars obtained via a modded save in the Auction House can get you reported by other players. The game logs car origins; a car that wasn’t earned legitimately stands out. forza horizon 5 all cars unlocked save game exclusive

Many guides suggest using these save files strictly in offline mode to avoid detection by anti-cheat systems. For Xbox: Even if you avoid a ban,

Forza Horizon 5 All Cars Unlocked Save Game Exclusive

For Xbox:

Even if you avoid a ban, using rare cars obtained via a modded save in the Auction House can get you reported by other players. The game logs car origins; a car that wasn’t earned legitimately stands out.

Many guides suggest using these save files strictly in offline mode to avoid detection by anti-cheat systems.