Why not build a fixed fiberglass Kammback mounted to the hatch? See above Photoshop. Starting with a foam buck, shape it, plaster it and bring it to a smooth, painted finish. 'Glass a female mold on it, pull that off and build the final, male piece out of that. Paint. Attach to car. Instant 15% FE gain.
If you're going to mess around with electronics and spoilers you might as well go for the big fish- expend a little more effort and get a lot better results. Do it right and no one will know. Say it's a sun shade.
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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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