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It's been said before, but the Flow Illustrator is not an aero testing tool. To know which works and which does not you need real world data. That said it appears the OEM spoiler pushes the air closest to the optimal profile (template). Do a tuft test on the rear window with and without the spoiler (or lips or whatever you are considering). Whichever one keeps the tufts down farthest back on the window is the one you want to use.
As for the front, get a spoiler that will go down only as much as the lowest chassis component. If possible, make a belly pan.
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He gave me a dollar. A blood-soaked dollar.
I cannot get the spot out but it's okay; It still works in the store
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