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Audi welcomes Porsche back to Le Mans like any sibling would

Ah, sibling rivalry. It really is a beautiful thing. It's even more beautiful when said siblings are automakers with very, very well-known racing histories. That's how you get videos like this, which is Audi's way of welcoming Porsche back to the top flight of Le Mans racing.
Yes, Audi has taken its R18 E-Tron Quattro back onto public roads, wowing schoolboys and scaring farmers (who appear to be riding classic Porsche tractors), as it travels from Ingolstadt to Zuffenhausen, just to taunt its corporate frenemy.
Take a look below for a video to see just what that teasing looks like.

Mercedes-AMG GT vs. Porsche 911 [w/poll]

Mercedes-Benz designed the AMG GT to compete head-on with the Porsche 911. It's a clear, singular purpose, and Benz brings a lot of money, technology and race-bred expertise to the fight.
The AMG GT is Merc's followup to the awesome SLS AMG, the retro-modern, gullwing-doored coupe that took us by storm half a decade ago. But this new GT coupe is a more focused sports car than the SLS, rather than an all out supercar capable of extreme performance. It's got a brand-new V8 engine, and state-of-the-art technology that help it to not only be a proper Mercedes, but to be a serious performer.
Mercedes will sell its new baby in two models. The GT S arrives first, in spring 2015, followed by the standard GT in mid-2016. Of course, there's room to grow from there. And while Porsche may have already expanded its 911 range to include a vast variety of models, here's how Stuttgart's icon stacks up against Affalterbach's bad boy.

Magnus Walker turbocharges his love for the Porsche 911

He's had his fill of early, long-hood Porsche 911s - he owns at least one from each model year, from 1964 to 1973 - so Magnus Walker, a fanatic of the Stuttgart, Germany-based automaker, recently set his sights on the early Porsche 930, as documented by this XCAR video called 'Turbo Fever.' Let us translate: pretty soon Walker will own all of the earliest, non-intercooled 911 Turbos - at least one from each model year, starting at 1975 and ending at 1977 (though the 1975 911 Turbo Carrera never officially was imported to the US by Porsche, so it'll be tougher to find one Stateside).
Any Porsche enthusiast can tell you why they love their car, and it often comes down to the small details that differentiate one model year from another. One of many examples is the mid-'80s 928. They look similar, but the basic difference between a 1984 Porsche 928 S and a 1985 928 S (US-spec) is two camshafts and 54 horsepower, though each car's V8 has its own pros and cons. We'll let Magnus Walker tell you all about the 930 and what makes the first three years special, as he's becoming quite the expert on early, air-cooled 911s. When the nearly 15-minute mini-documentary was filmed, which you can view below, he already had added four early 930s to his collection!