Ferrari were suddenly in much better shape at Spain thanks to a new rear end package. While previously the sidepods ended in between the rear wheels, a big air exhaust is now in place further ahead. The solution is very similar to an update that Renault introduced at the Chinese GP.
Along with it, the engine cover was redesigned to form a slightly lower curve, aiming to provide better efficiency of the rear wing due to a cleaned up air stream. Close to the car's centre however, the cover features elongated openings to provide cooling for the car's internals. Similar to Red Bull, the teams wanting to have air exits in that region have no option but to make them small as other apertures further away from the car's longitudinal axis are prohibited.