VGs
I don't ordinarily recommend them,but Wheeler Air Tabs were designed to help with notchback issues.The Mitsubishi Lancer Evo is an example of a car which was tested,and found to benefit a little.
Also,the Mercedes-Benz 190 2.3 received a backlight header air deflector and rear wing to help mitigate notchback-related issues.
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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