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Other additions in drag come from the larger wake generated by the wider car. The wake is a large region of low pressure that trails behind the car until airflow has time to close in and increase the local pressure. Part of the reason for the top roof line spoilers on the STI is to reduce this wake, particularly on the hatchback model. The large wing in the rear adds to the total downforce generated but downforce does not come without costs. Here’s a great CFD (Computational Fluid Dynamics) pressure plot of the WRC GR. Notice the region of high pressure (red / orange) at the front radiator opening and the large trailing lower pressure (blue / green) region behind the wing and rear hatch. (Thanks to Mathieu Horsky‘s Good Work!)