The Porsche Cayman GT4 is one of the worst kept secrets in Germany and that trend continues as the company has accidently listed the model on their North American Driving Experiences website.

The Porsche Cayman GT4 is one of the worst kept secrets in Germany and that trend continues as the company has accidently listed the model on their North American Driving Experiences website.

While the site doesn't reveal anything about the car itself, its listing helps confirm that Porsche is working on a new range-topping Cayman to slot above the Cayman GTS.

As we have previously reported, the model will feature an aggressive front bumper, a front lip spoiler and a prominent rear wing. The car will also have lightweight wheels and a high-performance braking system.

There's been a lot of speculation about what will power the model but the most likely candidate is a detuned version of the 3.8-liter flat-six engine that is used in the 911 S. Of course, there have also been rumors about everything from a plug-in hybrid powertrain to a twin-turbo 3.6-liter flat-six with approximately 450 PS (331 kW).

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