FIA forces Mercedes to abandon controversial diffuser after Ferrari complaint – Mercedes has been forced to modify an innovative diffuser solution after the FIA intervened following complaints from Ferrari and Red Bull. Consequently, when Mercedes appeared in Montreal with its own serrated solution, Ferrari immediately sought clarification from the FIA. FIA intervention forces Mercedes changeMercedes initially made some adjustments to the diffuser following discussions with rivals and the FIA. Mercedes and Ferrari remain locked in technical battleThe diffuser dispute is another example of the intense development race surrounding the 2026 regulations. With every major upgrade examined by rivals and the FIA, Mercedes, Ferrari and Red Bull will continue searching for legal performance gains as development intensifies through the second half of the season.