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Different cars have different aero characteristics to begin with, Andrzej & Weather had cars ideally suited for a Kamm, there was essentially nothing aero about where the air left the backs of their cars. This Acura has quite a bit going for it in that the top of rear glass area has a large radius, and I've seen papers that show this is great for reducing the Cd. I'm not saying it's ideal, but, without knowing what the air is doing, a half-baked attempt to "Fill the Wake" in the case of this Acura CL will end up hurting the Cd. A very well executed Kamm going all the way back to the tail lights and having the sides shaped correctly would be the only way a Kamm would be an improvement on what is already a fairly aero car. The sides would be key to getting it right. We all know how to do the top part.
I pretty much gave up on making a Kamm for my Civic due to this reasoning.
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