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Video: The Porsche Panamera Sport Turismo concept build process

Porsche has released a video featuring Style Director Michael Mauer charting the design process of the Panamera Sport Turismo concept. The 10-minute YouTube video, which also features General Manager Advanced Design Style Mitja Rorkert, follows the build process through each modeling phase right up until the presentation of the show car at this year's Paris motor show. "It always presents a special challenge when we develop a new kind of car for the Porsche brand," says Mauer, "precisely because we haven't been in the segment before, and the question of whether it matches the Porsche brand always looms in the background." We were impressed at the Panamera Sport Turismo concept's unveiling, particularly with its stance and detail execution, so the video is a chance to see just how this concept came into being.

Autoweek in review: What you might have missed

Here's a look at some big stories that you might have missed this week: -- The Detroit auto show opened to the media this week, with big reveals of the Dodge Dart, the Ford Fusion, the Cadillac ATS and two Chevrolet concepts. See all our coverage here. http://www.autoweek.com/section/detroit -- Autoweek editors announced their show favorites, crowning the Ford Fusion, Acura NSX concept, Dodge Dart and Porsche 911 Cabriolet with the Editors' Choice Awards.

McLaren P1 (2013): powertrain revealed with 903bhp and electric driving

McLaren has revealed first details of the P1 supercar's hybrid powertrain. The headlines are: a combined 903bhp, 664lb ft, and the ability to drive 6.3 miles on zero-emission electric power. McLaren P1 powertrain: the details The engine is, as expected, an uprated version of the 12C's 3.8-litre twin-turbo V8.