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GM's Ed Welburn walks Jay Leno through the Elmiraj concept's design [w/Video]

General Motors' vice president Global Design Ed Welburn stars in the latest of the 'Jay Leno's Garage' YouTube series, running the talk-show host through some of the new Cadillac Elmiraj concept's design features and what it means for the brand's future. We get a look at all the classic Cadillac design cues such as the vertical headlamps and tail lamps as well as the central hard crease that Welburn says is "important in every Cadillac". Leno and Welburn then move onto the Elmiraj's features, such as the large doors' integrated handles and the slimmer A-pillars before a more in-depth look at one of the concept's most striking features – the grille.

General Motors names Mary Barra to head global product development

General Motors named Mary Barra head of global product development on Thursday, succeeding Tom Stephens, who was named global chief technology officer of the automaker on Wednesday. An engineer, Barra, 49, is the first woman to hold the top product development job at GM. Since 2009 she has served as vice president of global human resources for GM--a key post as the automaker restructured and emerged from bankruptcy protection.

Audi welcomes Porsche back to Le Mans

Porsche is returning to the 24 Hours of Le Mans next weekend, and reigning champ Audi figured it would be nice to send a little welcoming committee to Stuttgart, Germany. The committee consisted of one driver in an R18 e-tron quattro LMP1 car. Keen eyes will notice the race car passing a red tractor, also a Porsche design.