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2015 Mercedes-Benz C63 AMG may pack 480 hp

Mercedes-Benz's new-from-the-ground-up 2015 C63 AMG has reached a final stage of durability testing, with prototypes hitting public roads near company's technical center in Germany. The BMW M3-fighting four-door is will debut at the Paris motor show in September. The new twin-turbocharged 4.0-liter V8-powered performance sedan is set for North American sale exclusively in its rear-wheel-drive-only guise.

VIDEO: Porsche Panamera

Porsche revealed the first images of its new four-door, four-seat super sedan last week, and now we've got two new videos to supplement our updated gallery. The video on the left is stock footage, while the car is put through its paces on a winding road perched high in the mountains in the video on the right. See below for our previous news articles on the Panamera and our 23 image gallery.

A fun car steers brand loyalty, study shows

Car buyers stick with their current brands if the automaker builds fun-to-drive vehicles, a customer-retention study revealed. The J. D.