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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.

2013 Porsche 911 RSR makes official debut

Porsche is ready to go racing in 2013, showing off a new 911 RSR today that is scheduled to compete in several endurance events this year. Based on the current 991 911, the new RSR will compete in the 2013 season of the World Endurance Championship and the 24 Hours of Le Mans. It will not, however, make an appearance in a North American racing series this year.
The 2013 version of the racecar has increased in wheelbase by some four inches, features a new wishbone front suspension in place of the last-generation's McPherson strut setup and boasts a new, lightweight six-speed racing gearbox. The engine, meanwhile, is an "optimized" version of last year's car, a 460-horsepower 4.0-liter boxer six-cylinder. Extensive use of carbon fiber and polycarbonate windows help the RSR shed weight, and Porsche has also balanced the weight more evenly with a lower center of gravity.
Porsche has thoughtfully dedicated some space to celebrate the 911's 50th Anniversary, with the number 50 clearly visible in the top-down view of the RSR, as well as along the doors. Scroll down to read the full Porsche press release, below.

Will Roegge makes 4K art of Jeff Zwart's 911 build and run up Pikes Peak

Will Roegge has turned his camera on Jeff Zwart and provided another gem, this time documenting Zwart's run up Pikes Peak and BBI Autosport. Bertim Besha dropped out of high school, then worked his way up to founding his own shop, BBI, that gathers a crew of tuners who are just as fastidious about their work as the customers are about their cars.
They prepped the 991-series Porsche 911 GT3 Cup Turbo, the product of combining a 911 GT2 that was the most powerful car Zwart drove up the mountain with a GT3 Cup that Zwart thought had the best handling. Two TiAL turbos and a lot of fettling make for a 3.8-liter flat-six with 700 horsepower, 700 pound-feet of torque and a 7,800-rpm redline. Zwart drove it to a heartbreaking second place this year, finishing less than 1.2 seconds behind the Time Attack 1 class winner when his car suffered its first mechanical issue of the week.
The first video below covers Besha, BBI and the build, the second is Zwart's run. As if the visuals weren't enough, sit back and enjoy the shrieking of the "Hill Climb Special," which is what the constellation Sirius would sound like if it could bark.