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At first, we thought Edmunds Inside Line's Ed Hellwig had blown a rod when we saw the headline of this entry in his Straightline blog. (I mean, a hedgehog with cataracts could tell that's a BMW M5.) But it makes perfect sense that a carmaker (like Porsche) would test the engine and underpinnings of a super-secret model (like the Panamera) under a test mule disguised as one of its competitor's models. At least, that's what all the spy shooters at the N rburgring say. Who are we to argue?

Spy photo: 2009 Porsche Panamera [Edmunds Straightline]

More on the Porsche Panamera [internal]