STUTTGART, Germany -- Porsche is replacing the naturally aspirated flat-six in the 2017 911 Carrera and Carrera S with a brand-new, more efficient turbocharged engine. Does it still excite?

August "Gustl" Achleitner, chief engineer for the 2017 Porsche 911, shoots up to the right-hander like a hungry shark aiming for its prey. Third gear, brake. Second gear, brake harder. Lift off and turn in smoothly. Keep the torque flowing, then — just past the second apex — boot it! We drift for one, two, three seconds, and then gracefully exit. "Could you ask the photographer to send me this picture, please?" says Achleitner.

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The 2017 Porsche 911 is, in most respects, a normal mid-cycle refresh of the current model. It sports such subtle changes like LED sidelights, new Xenon headlights, more sculptural taillights, motorized nasal air intakes that close above 10 mph, and a new all-black rear air intake with longitudinal rather than horizontal slats. The red Carrera S we're riding in wears only minimal camouflage: two strips of body-color tape at one end, two faux transparent taillight covers at the other. Most passersby will just see another 911.

Look closer, though, and you'll spot the two intercoolers stowed away in the rear fenders. They cool a new turbocharged, 3.0-liter flat-six. The base Carrera has the same engine in 370-hp tune. Here in the Carrera S, it produces 420 hp at 6,500 rpm. As far as the maximum torque is concerned, it's 332 lb-ft against 369 lb-ft in the Carrera, which is available from 1,700 to 5,000 rpm in both trims. That's a boost of about 20 hp and about 45 lb-ft over its predecessor, which isn't much. But Porsche claims the way in which that power and torque is delivered makes all the difference.

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With a dual-clutch automatic, the Carrera S can accelerate to 60 mph in 3.7 seconds, eclipsing its predecessor by 0.4 seconds and edging the 430 hp, 2015 GTS by one-tenth of a second. Top speed climbs by a token 1 mph in both Carrera and Carrera S. And then there's the real pay off: Consumption drops by between 6 and 13 percent in European testing. (U.S. fuel economy estimates are still not out.)

Achleitner says he prefers to operate the Carrera S in manual mode, "so that I'm always close to that wide sweet spot, where this engine responds without delay." Without delay? From a passenger perspective, there is no turbo lag as such, but somehow the throttle action does not feel quite as electrifying as we remember it from the soon defunct GTS motor, which reached its cut-out speed 500 rpm later. There's now so much low-end power that there's now no real need to tap the 2,300 rpm that lie between the torque summit and the performance peak.

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"We worked long and hard to make the new [engines] sound good, to give them a voice of their own," says Achleitner, changing the subject. "It was a difficult task, but I am happy with the result." While the run-of-the-mill versions are said to be a little more decibel-conscious, our test car is fitted with the vocal sport exhaust, which trumpets through two fat tailpipes positioned below the license plate. Full acceleration makes horses prance, sends birds flying, and arches the backs of resident cats.

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What about the extra weight for the turbos, intercoolers, and related plumbing? Does it upset the already rear-biased weight distribution and the handling balance? "Not the case," states the man at the wheel, without batting an eyelash. "On the contrary, the [2017 911]feels even more relaxed at speed, and the front axle in particular is firmly planted." Achtleitner sets the drive program to Sport, presses the stability control button, and breaks out a mischievous grin. "We developed a new slide-without-regret mode, which permits astonishing drift angles yet prevents you from ending up in the ditch. It's a software thing supported by rear-wheel steering, which can now be specified for the Carrera S." The rider spurs the red stallion, power-over steering through every corner that asks for it, peppering the side windows with insects.

Just as my stomach is about to make an emergency call, the chief shepherd slows down, turns off paradise road, and is heading for the Pforzheim basin. Rounding up his new favorite ram with two fingers and a ginger right foot, Achleitner aims at every drainage grid, manhole cover, and speed bump. "What do you think? Can you feel the difference? We reprogrammed the [adaptive dampers], and this is the result: better low-speed ride, more progressive response, decent compliance even in combination with 20-inch tires. Also, the front axle can now rise 30mm [about 1.2 inches] to climb up steep ramps and tall curbs." That's nice, Herr Achleitner, but this particular extra costs about as much as a dozen replacement bumpers.

Still, we see Achleitner's point: This 911 aims to be even more comfortable every day than its predecessor. Thanks to a long-legged top gear, an eager-to-upshift automatic, and the ability to coast under trailing throttle, this Porsche is a remarkably relaxed and efficient cross-country cruiser.

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At the other end of the spectrum, that distinct willingness to burn rubber and peel tarmac has been retained and refined. All it takes to access the dark side of the car's character is a flick at the mode selector integrated, Ferrari-style, into the new sport steering wheel. There are five different attitudes to choose from: Normal, Individual, Sport, Sport Plus, and Sport Response, the last of which is clearly tuned for track use. The modes change the character of the powertrain, dampers, rear air dam, and exhaust. That's a lot of choice, yet we'd ask for even more, specifically the ability to tweak the automatic transmission and engine separately. Why? Because there is no need to mate a very fast throttle response to an unsuitably low gear and correspondingly high revs. Of course, you can still control your shifts all the time with the seven-speed manual transmission, which has been upgraded for 2017 with a double-plate clutch for more precision and less effort.

Achleitner takes an excursion through Swabian suburbia, which provides us time to check out the upgraded infotainment system. The center console itself has not changed much, but the new in-dash monitor offers better graphics and additional features like Apple Car Play and Google Earth. You can also go online, have messages read out to you, hop on Facebook, and check out the weather. (You can in Europe, that is. U.S. safety regulators will likely nix these potentially distracting features.) The touchscreen itself now supports swiping, zooming, and scrolling. Proximity sensors enlarge your fingertip's icon of desire.

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We change pace one more time as we hit the A8 autobahn. Almost immediately, my driver gives his baby stick. Initially, full throttle feels like departing from the launch pad of an aircraft carrier, but one eventually gets used to its kick-and-rush rhythm. Against the inner stopwatch, the 2017 Porsche 911 feels barely faster than its more raucous, rev-hungry predecessor. What puts the new car in a league of its own is the meatier low-to-mid-range punch and the greater forward urgency in seventh gear.

But, for a moment, let's forget about sheer velocity. Let's instead relish the 2017 Porsche 911's confidence-inspiring, high-speed directional stability. Dopey trucker with rear-view mirror allergy? Indicator-lazy sales rep in text-messaging coma? Grandma sleeping in the fast lane? No problem when you're at the helm of the new 911, which decelerates with vitriolic spontaneity and follows your chosen line when you must suddenly sway and swerve.

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The second time we exceed an indicated 170 mph, a warning beep recommends we check tire pressure. "Instead of the high-performance setting, I set the tire pressure lower, which it cushions the ride by a fraction," admits a slightly embarrassed Achleitner. "In combination with a softer front anti-roll bar, it makes the suspension less susceptible to lateral irritations and better balanced overall. Even a lift-off maneuver at 180 mph will do no harm." In other words, we'll have to try rolling over those manhole covers with higher tire pressure.

We approach our exit much too soon. At the lights, we turn right and storm up the hill toward Weissach. One more chance to high five the rev limiter at 7,300 rpm, to let my broad back cushion the full-throttle upshift kicks, to boo the fake double-declutch as we slow down for the main gate. Game over. Driver change? Sadly, not until the official launch of the 2017 Porsche 911 in November. We hear the coupe and cabriolet go on sale late this year, followed through 2017 by the Turbo proper -- which will feature a 4.0-liter engine -- the C4 variants, and the Targa.

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2017 Porsche 911 Carrera S Specifications

On Sale: December 2015

December 2015 Price: $100,000 (est)

$100,000 (est) Engine: 3.0 twin-turbo DOHC 24-valve H-6/ 420 hp @ 6,500 rpm, 369 lb-ft @ 1,700-5,000 rpm

3.0 twin-turbo DOHC 24-valve H-6/ 420 hp @ 6,500 rpm, 369 lb-ft @ 1,700-5,000 rpm Transmission: 7-speed manual or 7-speed dual-clutch automatic

7-speed manual or 7-speed dual-clutch automatic Layout: 2-door, 4-passenger, rear-engine, RWD coupe

2-door, 4-passenger, rear-engine, RWD coupe EPA Mileage: N/A

N/A Suspension F/R: Strut-type, coil springs/ multilink, coil springs

Strut-type, coil springs/ multilink, coil springs Brakes: Vented discs

Vented discs Tires: 235/45ZR-20 / 305/30ZR20 Pirelli P Zero

235/45ZR-20 / 305/30ZR20 Pirelli P Zero L x W x H: 176.8 x 71.2 x 51.0 in (est)

176.8 x 71.2 x 51.0 in (est) Wheelbase: 96.46 in

96.46 in Headroom: N/A

N/A Legroom: N/A

N/A Shoulder Room: N/A

N/A Cargo Room: 4.76 cu ft (est)

4.76 cu ft (est) Weight: N/A

N/A Weight Dist: N/A

N/A 0-60 mph: 3.7 sec (est)

1/4-Mile: N/A

N/A Top Speed: 188 mph (est)