From the November 2014 Issue of Car and Driver

Toasting the Porsche 911’s 50th birthday a year ago, we decreed its life and times to be exceptional. This is the two-door that defined what a modern, fast, and ­comfortable sports car should be. Porsche’s half-century of earnest development turned a flawed blueprint into a machine with grace and soul. If you don’t long for a 911 of some stripe, your head is in the wrong magazine.

Which is why any manufacturer serious about building a worthy sports car hangs its bull’s-eye on the 911’s shoulders. Mercedes—or, more accurately, the newly coined Mercedes-AMG—is the latest to fix aim with its GT/GT S. The Benz boys are no strangers to sporty two-doors. There’s the SLK for mistresses and the SL for their sugar daddies. But those roadsters bow down to the preproduction GT S coupe we recently drove near AMG’s ­Affalterbach engineering lair northeast of Stuttgart.

View Photos Curious that when Mercedes-Benz and Jaguar go after the Porsche 911, they end up designing cars with quite similar rooflines and rumps. GREG PAJO, THE MANUFACTURER

A mile into our mountain-road sprint, with AMG chairman Tobias Moers chaperoning, it’s clear why SL is not part of this car’s name. While the GT S is the lineal descendant of the SLR McLaren and the SLS AMG, this newborn is a different kind of predator. From the SLR, two nose jobs, wheelbase trims, door schemes, and price cuts finally have yielded a sports car armed to maim Porsche 911 GT3s and Turbos (not to mention the Aston Martin Vantage, Audi R8, Chevy Corvette Z06, Jaguar F-type, and Maserati GranTurismo). Prices are nowhere near final, but we’re guessing the base GT will start at $115,000, while the more powerful, fully outfitted GT S will run $150,000.

Beneath the long hood, AMG’s new 4.0-liter V-8 is loud and potent. Its deep startup growl becomes a quaking rumble when the two turbos roll in. Thrust is instantaneous and intoxicating. Paddling the seven-speed automatic sends a repertoire of barks and snorts rattling through the mufflers. Thanks to its two-cylinder edge over the 911, the GT S is audibly assertive when provoked, yet subdued in the upper gears under gentle throttle.

READ MORE: In-Depth with the AMG GT's Stonking M178 Twin-Turbo V-8

The audio is all-natural, Moers says, because he despises the synthetic soundtracks used by others. What’s missing is a soprano aria at the 7000-rpm redline. The turbos mute the high notes so effectively that this pipe organ stops short of the upper octaves.

View Photos GREG PAJO, THE MANUFACTURER

Corroborating evidence that the GT S is a worthy 911 foe: its exceptional agility. AMG trimmed 175 pounds off the SLS’s 3750-pound curb weight and cut the wheelbase by two inches. The lighter engine and shorter nose help shift the GT S’s weight balance to 45/55 percent, front/rear, what AMG development boss Jochen Hermann considers the perfect distribution. (At this point we know little about the GT except that it costs less, makes less power, and has less equipment than the GT S.)

Uncannily quick steering response means that you turn the GT S’s wheel a few degrees and the nose sniffs for the apex with bloodhound keenness. The effort builds quickly and linearly, but the steering never feels too heavy. Pushed to their limits, the Michelin Pilot Super Sports (265/35R-19s in front, 295/30R-20s in back) ultimately show hints of understeer. Hearing the u-word, “understeer,” Moers says that adding or ­subtracting a touch of throttle at the fringes of grip reestablishes the neutral behavior that his chassis ­engineers diligently baked into the car.

Specifications VEHICLE TYPE: front-engine, rear-wheel-drive, 2-passenger, 3-door hatchback

ESTIMATED BASE PRICE: GT, $115,000; GT S, $150,000

ENGINE TYPE: twin-turbocharged and intercooled DOHC 32-valve V-8, aluminum block and heads, direct fuel injection

Displacement: 243 cu in, 3982 cc

Power: GT, 456 hp @ 6250 rpm;

GT S, 503 hp @ 6250 rpm

Torque: GT, 443 lb-ft @ 1750 rpm;

GT S, 479 lb-ft @ 1750 rpm

TRANSMISSION: 7-speed dual-clutch automatic with manual shifting mode

DIMENSIONS (C/D EST):

Wheelbase: 103.5 in

Length: 180.0 in

Width: 76.5 in Height: 50.5 in

Curb weight: 3600 lb

PERFORMANCE (C/D EST):

Zero to 60 mph: 3.7/3.5 sec (GT/GT S)

Standing 1/4-mile: 11.8/11.5 sec (GT/GT S)

Top speed: 190/194 mph (GT/GT S)

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