The S8's 4-liter turbocharged V-8 now has up to 605 horsepower and 553 pound-feet of torque in Plus spec, a big increase over the current model's 520 hp and 480 lb-ft.

Only the larger, heavier and much costlier V-12-powered Mercedes-Benz S65 offers more power.

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That big power increase and the S8's lightweight aluminum chassis and skin combine for a 0-62 mph time of just 3.8 seconds.

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Top speed for this executive express rises to just shy of 190 mph when derestricted.

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The S8's high-tech, quilted-leather cabin remains as inviting as it's ever been.

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Global pricing and availability hasn't been announced for the S8 Plus yet, but CNET anticipates a starting price of around $140,000 if it makes it to the US.

That's significantly costlier than the standard S8's $114,900 MSRP in the US, £80,735 in the UK and $300,000 in Australia on the road.

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While the A8 upon which the S8 is based is available in an extended-wheelbase L model, the S8 comes in standard-length exclusively.

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The S8's rear is its most subtle aspect, with smoked taillights and a gloss-black diffuser being the most noticeable changes.

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Matte-effect floret silver paint is an Audi S8 Plus exclusive hue.

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An eight-speed Tiptronic gearbox is standard on the S8. Note Audi's MMI infotainment finger-swipe touchpad ahead of the shifter.

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The rear appears no less comfortable than the front, with both quilted-leather outboard seats getting their own climate control and power articulation.

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Special door sill garnishes call out that this isn't a garden-variety A8.

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European S8s feature dynamic turn signals with a sweep gesture. Differing lighting legislation may keep these units from US dealerships.

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The European model shown here includes Matrix headlamps featuring 25 LEDs with individual control.

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Four subtle, round exhaust tips peek out beneath the S8's rear bumper.

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This cutaway drawing reveals the S8's all-wheel-drive internals. Also note the carbon-ceramic brakes.

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