Mercedes’ rear-wing performance could be negatively affected by the FIA’s intervention, while Red Bull’s underbody is also rumoured to be impacted, as per Germany’s Auto Motor und Sport. A separate report on Formu1a.uno also claims that Red Bull and Mercedes are “two names” which “consistently appear” in relation to the new ruling.An anonymous F1 team boss told the Italian publication that “many teams will have to make changes” as a result of the new technical directive which comes into force from this weekend’s Singapore Grand Prix. What is the technical directive?F1’s governing body the FIA is clamping down on flexi-wings through the…