I don't think this is the Cayenne, it looks too small. It could very well be the upcoming Porsche "Roxster," based off the Audi A4/A5/Q5 platform.

Notice the very similar character lines on the Q5:



This makes me think that Porsche only did a reskin.

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'08 BMW X5 4.8i *'06 Audi A3 2.0T DSG *'05 Audi S4 Cabriolet

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