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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.

Hummer HX concept previews H4

By Ben Whitworth First Official Pictures 13 December 2007 10:00 Hummer has unleashed three of its newest and youngest designers to create the HX concept that will make its debut at the Detroit Motor Show in January. Fresh out of the College for Creative Studies in Detroit, designers David Rojas (he created the blue concept), Min Young Kang (the red and black creation) and Robert Jablonski (the grey car) were assigned to create a vision of Hummer's off-road future, creating a smaller, lighter and more agile junior Hummer. So who was actually in charge of these fledglings?

GM improves, Toyota slips as industry sales decline eases

Ford, Honda and General Motors posted their smallest sales declines of the year in April, while Nissan and Toyota had their largest, as the industry improved from depressed levels of February and March. Drops of 33 percent at Ford Motor Co. and GM were in line with analysts' forecasts, as was American Honda's 25.3 percent slide.