I've been a fan of Coanda since I read about his 'afterburner' airplane.
Click for video
That third CFD appears to have a trunk-mounted spoiler. This windshield header device seems to be a diverging duct which would retard [if I can use that word] the air that wants to wrap around the header.
youtu.be/ZDpScek3KBc?t=92 Here's it shown without the rear baffle plate.
That is surprisingly narrow, no wider than the headrests.