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The first SRT Viper is sold, we spot an exotic XTS, and the 2013 SVT Raptor offers more off-road fun, this week's Autoweek in review

The first SRT Viper crossed the block at Barrett Jackson in Orange County this past week, for a cool $300,000. All the proceeds will go to the Austin Hatcher Foundation, a charity to help families and children affected by pediatric cancer. While the Cadillac XTS hasn't been a stranger on public roads around Michigan, this heavily camouflaged example is a bit of a mystery.

Renault designers on their interpretation of luxury [w/Video]

Renault's design chief Laurens van den Acker and his design team have stressed how the Initiale Paris concept previews how Renault design's tactics will help steer clear of its rivals within the premium segment.  The concept – the sixth to be developed in the design strategy inspired by the cycle of life, now in the Wisdom stage – heralds Renault's return to the high-end market after a number of years. It was, therefore, important that the design be a positive rejection of traditional ideas of luxury, design director of concept cars Axel Breun believes. Designer Choung Sun Oh goes to great pains to stress how the design team worked towards developing a highly original design to set them apart from rivaling brands upon re-entry.

Ford improves top design on its 2015 Mustang convertible

Ford revealed details on its forthcoming 2015 Mustang convertible, whose top features several highly welcome improvements over the outgoing model’s, making it quieter, more compact and easier to operate. Though Ford continues to call the cloth top a two-layer design, it now sports a 10-mm thick cushion between the twill covering and the headliner layer, serving as both insulation and sound deadening. Ford says with the top up, the cabin is almost as quiet as the coupe’s on the road.