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April Fool's has come and gone, so what's that awkward-looking Cayenne doing sitting on a too-small chassis in these new spy shots? The smart money is on "test mule," and that likely means the new Panamera's platform is getting a workout on Germany's N rburgring, sans body, according to World Car Fans. The Panamera, if you've been following such things, is Porsche's upcoming front-engined grand tourer, due in 2009, which some say will spawn a 928-style two-door in addition to the expected four-door Panamera "coupe."

First Porsche Panamera Spy Photos [World Car Fans]

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More on the Porsche Panamera [internal]