Formula One’s obsession with sidepods on this year’s cars reached new heights on Saturday when Red Bull revealed a tweak to their design on the last day of pre-season testing in Bahrain. Red Bull driver Sergio Perez was quickest in the morning session with a 1 minute 33.105 seconds. It may suggest the redesign worked although timings in tests are hard to judge with teams running different strategies. Red Bull’s world champion Max Verstappen is due to head out in the final afternoon session in Bahrain. Alfa Romeo’s Chinese driver Guanyu Zhou, making his debut this season, was an impressive seco…