Are vehicle mods allowed in gta online?

The only verified information in the supplied evidence concerns Grand Theft Auto V’s single‑player campaign, its protagonists, and the fictional world of San Andreas. It does not mention the online multiplayer component, vehicle customization options, or any modding system. Because the source does not address GTA Online, there is no evidence to confirm or deny the existence of vehicle mods in that mode. To determine whether vehicle modifications are permitted, one would need to consult additional documentation or official statements from Rockstar Games that specifically address the online multiplayer features. Without such evidence, any claim about vehicle mods in GTA Online would be speculative and therefore should be treated as uncertain.