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VW Beetle Dune at the Detroit auto show

Of all the production-leaning concept vehicles at the Detroit auto show, the Volkswagen Beetle Dune's the sort of flight of fancy nobody was looking for. Nissan's Sport Sedan heralds the look of the next Maxima, which will likely trickle down in some way to future Altimas, Sentras and Versas. It looks as if Nissan will put one of its techno-retro RWD IDx concepts into production.

Porsche 911 gets new Sports Exhaust

As we commented recently, the 911 is the soul of Porsche; its reason to be, if you like. Which is why the driver experience is at the heart of all that Porsche does with the 911′s development. And Porsche has added a new option to the 911 Carrera and Targa range, available from February.

More Power! Get the details on the potent Porsche 911 GT3 RS 4.0

Porsche has ramped up the already heady performance of the 911 GT3 RS through the adoption of a new, naturally aspirated 4.0-liter version of the company's sturdy, horizontally opposed flat six-cylinder engine. The unit kicks out 50 hp more than the 3.8-liter six-cylinder used in the existing 911 GT3 RS. This mill claims 500 hp at 8,250 rpm, a figure which makes the speedster the most powerful naturally aspirated road-going version of the 911 ever.