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2014 Porsche 911 GT3 [w/video]

The Bearable Lightness Of Being
Start with a standard Porsche 911 Carrera and its 350-horsepower, 3.6-liter flat six-cylinder engine. Bore a crepe-thin slice of aluminum from each cylinder to get to 3.8 liters, add a wider track out back and two extra exhaust pipes and voila, you can append an S to the Carrera's name. Hang two sets of wet, multi-disc clutches along its spine and you can make that a 4, or a 4S. Bolt on two forced-induction compressors and piping, add two fender vents and comically wide rear tires and you've redeemed your ticket to a Turbo. Increase the boost pressure and swell the corral to 560 horses and you have the Turbo S, which is the Virginia Slims of the 911 line-up because it's come a long way, baby.
Or you can go in a different direction. At that second stop, grab the 3.8-liter and cart it over to the engineers at Porsche's development center in Weissach, Germany. If racing were meat, they would be among the alpha carnivores. The baseboards in their homes are probably painted with miniature billboards for motor oil and vintage cigarettes along the straights, red-and-white stripes around every corner.

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.

2015 Porsche Panamera S First Drive

Porsche brought the Panamera in for its garage makeover and drove it out looking almost exactly the same. Turns out it was one of those fancy German refreshes where everything happens in places you can't immediately see, as we found recently on the 2015 Volkswagen Jetta TDI. The marquee revision across the lineup is under the hood, where every engine gets, at the very least, more power. Such is the case for the naturally aspirated V6 in the entry models, fitted with an increase of 10 horsepower for a total of 310. The same goes for the naturally-aspirated 4.8-liter V8, which lives only in the Panamera GTS now, and gets 10 more hp for a total of 430. That same V8, twin-turbocharged in the Turbo model, is graced with 20 more ponies for 520 hp. The mightiest marquee revision is saved for the S models, which surrender their use of the 4.8-liter V8 and get a 3.0-liter, all-aluminum, twin-turbocharged V6 in its place. It's a brand-new engine designed in-house and related to the 3.6-liter V6 in the base models, but with new features like a magnesium timing chain cover, variable camshaft timing for the intake and the exhaust valves, and a new fuel- injection system. Putting out 420 hp and 384 pound-feet of torque, it's got 20 more hp and 15 more lb-ft than the V8 it replaces. What's more, torque used to peak from 3,500 to 5,000 rpm, but the new torque curve maintains maximum twist from 1,750 to 5,000 rpm. It is less thirsty as well, posting an estimated fuel economy of 17/27 miles per gallon city/highway, besting the 16/24 city/highway of before. An improved stop-start mechanism contributes to this, as it cuts the engine earlier, and the coasting function benefits from a new disc clutch that can decouple the seven-speed PDK dual-clutch transmission from the driveline. As we wrote in our Panamera S E-Hybrid review, you'd need to be obsessed with the Panamera to notice the sheet metal changes around that engine. It's the perfect car to ask, oh so coyly, "Notice anything different about me?" while you stand there dumbfounded, silently thinking, "No." Here is your cheat sheet: the front and back ends are "tighter," meaning faintly more squared off, the front intakes are larger, the tailgate gets wider rear glass over the same-sized opening, the rear spoiler is wider, and the rear license plate bracket has been mounted lower. But even now that you know what the changes are, odds are still 200-to-1 against you actually noticing.