Porsche has unveiled two very different versions of the enticing 918 project. First came the 918 Spyder at the 2010 Geneva Motor Show, and then the German automaker took the wraps off the 918 RSR in Detroit. While the former was Porsche's vision for a roadgoing hybrid roadster, the latter took the form of a fixed-roof racing coupe. The question on everyone's minds, though, is what form the eventual production version will take.

According to reports, while the racing version will retain the fixed roof and upwards-hinged doors of the RSR concept, the roadgoing version will offer the wind-in-your-hair experience of the Spyder. Autocar states that the production model will feature a removable roof panel, much like the Carrera GT. Confirmation reportedly comes from Wolfgang Dürheimer, Porsche's outgoing VP for product development who is switching to head up Bentley and Bugatti, not to mention taking the reigns at Volkswagen Group's motorsports division.

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