Renault Sport Managing Director Cyril Abiteboul says Ferrari’s sudden surge in PU performance over the last month has left the French manufacturer scratching their heads.

Ferrari introduced a major PU update in last month’s Canadian Grand Prix and has been adding to their package in the five races that have followed.

Abiteboul told Motorsport.com Ferrari now have the “upper hand” over Mercedes-AMG with PU performance, adding that the Scuderia’s step has been “amazing.”

He did later add the suddenness of Ferrari’s performance increase has been “strange”, but made a particular note that this doesn’t necessarily make the change illegal.

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