Sven7: Thanks for the reply. So if I understand correctly, you are suggesting that the flow over the rear window is already attached. I will have to tuff test that to confirm. I suspected it would not be attached, as the angle is >20*, and these vortex generators can be found on other vehicles (eg Mitsubishi Evo) in order to maintain attached flow. If I can confirm the flow is attached, then the project is that much simpler!
I was already planning on at least a partial belly pan and perhaps rear wheel fairings, in order to get that flow as smooth as possible.
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