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When a spoiler like that is beneficial, it is almost always a band-aid, because the aero of the original design is relatively poor. The older Porsche 911s were this way, and for a very similar reason--the rear slope was too great, so adding a spoiler would create a flatter "virtual" rear slope that not only reduced lift (the primary goal for the 911 and likely the Z as well) but also reduced drag slightly.
-soD
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