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A completely new design for the US. The upper profile and flap feature a dished, V shape, which has proved more efficient in terms of top speed in testing, at the same time maintaining clean and efficient airflow at exit, so as to help with air extraction from the rear diffuser. New endplates sport four curved diagonal gills, similar to those introduced by Toyota at the start of the season. These reduce turbulence around the inner edge of the endplates.