Audi S8: The 563-HP Sleeper Sedan That Hides Its Power
The performance divisions of premium automakers, such as Mercedes-Benz’s AMG and BMW’s M, often wrap their range-topping ‘super sedans’ in overtly aggressive sheet metal to set them apart from the run-of-the-mill models. However, another German brand has steadfastly pursued the potent performance car game with considerably more restraint yet similar capability, and delivered the sure-footed poise of all-wheel drive long before its rivals.
It’s the automotive equivalent of muscle-bound Arnold Schwarzenegger versus the quiet yet potent Jason Statham.
Muscular Aggression Versus Subtle Sophistication
The Mercedes-Benz S63 AMG, BMW M5 (as BMW doesn’t produce an ‘M7’) and the home-grown Cadillac CT5-V Blackwing are prime examples of luxury cars that have been turned up to eleven, trading their tailored suits for body-hugging performance gear that boldly emphasizes the mechanical muscle to match their more aggressive looks.
The high-performance variants of the S-class, 5-Series and CT5 are instantly (and intentionally) distinguishable from the run-of-the-mill offerings in the range, and justifiably so considering their explosive performance potential and top-tier pricing. The 2026 Mercedes-AMG S 63 E Performance starts at $189,800, while the M5 kicks off at $123,300. The CT5-V Blackwing is much cheaper with a starting MSRP of $98,900, although most cars will be optioned much higher.
Audi, though, has perfected the art of subtlety and sophistication over the years, even in its ‘S’ range of performance cars, which sit one tier below the all-out RS models. It also plays in the large luxury performance car game, but with an understated sleeper that has supercar-baiting capability.
Performance In A Velvet Glove
The Audi S8, which is priced exceptionally close to the BMW M5 at $130,000 before options or destination charges, proves that impressive performance can also come wrapped in a velvet glove, without the brutish character that defines its rivals (both the S63 and M5 have now mutated into much heavier plug-in hybrids). It’s a philosophy that debuted with the first-generation (D2) S8 in 1996, and continues today with the D5 fourth-generation model.
For all but the most fervent enthusiasts, there are few obvious cues to easily differentiate the S8 from a well-optioned luxury A8 on which it is based, despite it hiding a mighty twin-turbocharged V8 under the hood. Only the discreet S8 badges, quad tailpipes and optional blacked-out trim provide hints that this is no laid-back limo. In the premium luxury sector where extravagant status symbols are valuable commodities to be flaunted, this has resulted in the S8 flying well under the radar.
In Q1 of 2026, Audi only moved a total of 487 units of the A8 and S8 combined, while Mercedes-Benz sold 1,779 S-Class models, including the S63. By comparison, BMW retailed 2,260 7-Series cars over the same period, and 5,489 units of the 5-Series. None of the automakers list the performance models separately, but Audi’s rivals have a massive market share advantage, of which their fastest and most powerful flagships account for a significant portion.
Subtlety With A Brutal Punch
The refined and subtle character of the S8 makes it a somewhat anonymous, more invisible, offering amongst the large and loud super sedan big hitters. But for buyers that want a more discreet yet equally large and luxurious executive car with outstanding pace, the S8 is just the ticket – especially on the used car market. But more on that later.
There’s no denying the appeal of a twin-turbocharged 4.0-liter V8 that produces 563 hp and 590 lb-ft of torque. The S8 still uses a 48-volt mild hybrid system compared to the full plug-in hybrids found in its German rivals, with the M5 delivering a substantial performance boost to 717 hp and 738 lb-ft from its EV-enhanced 4.4-liter twin-turbo V8. The AMG is the most extreme of the lot, with a frankly astounding 791 hp and 1,055 lb-ft from its 4.0-liter twin-turbo V8 and EV power unit.
Yet with the adoption of electrification, the current M5 is 265 lb heavier than the 5,126 lb S8, while the S63 carries a substantial weight penalty of 705 lb over the Audi. It’s no surprise, then, that the Ingolstadt contender is quick off the mark. An independent MotorTrend test recorded a 3.7 second time for the current S8, while Car & Driver achieved an astonishing 3.2 seconds in a similar car.
The manufacturers’ claimed times are 3.8 seconds for the S8, 3.4 seconds for the M5 and 3.2 seconds for the S63 – and any time under four seconds is seriously rapid indeed, never mind for a luxury executive barge. For Audi to be in this picture without the benefit of PHEV assistance is noteworthy and reinforces its appeal as a fast and satisfying long-distance missile.
The All-Wheel Drive Innovator
One of the keys to the S8’s formidable acceleration is the sure-footed traction of its quattro all-wheel-drive system, a technology with deep roots in Audi’s performance history. Quattro made its way into the luxury-sedan arena with the 1988 Audi V8. This was followed by the groundbreaking A8 in 1994 and, two years later, the first S8, bringing Audi’s understated performance formula full circle.
It took Mercedes-AMG 17 years to follow suit with the W222-generation S63 AMG 4Matic, while the first all-wheel-drive BMW M5 was the 2017 F90 with xDrive. The M5 did have the benefit of a selectable 2WD mode as an enthusiast-oriented feature, though.
Although not as agile as the slightly smaller and more focused M5, the S8 is engineered for far more spirited driving than Audi’s more cosseting A8 variants. It features a performance-tuned predictive active suspension that uses sophisticated electronic systems to scan the road ahead up to 18 times per second, continuously adjusting the dampers to smooth out bumps and undulations. The system can also actively tilt the body into corners, helping maintain higher cornering speeds while reducing lateral forces on occupants.
A Used Performance Car Bargain
The current Audi S8 has a new list price of $130,000, without options or destination charges. Head to the second-hand market and the S8’s obscurity and steep depreciation make it an absolute bargain. You can pick up 2022 models for $62,000 to $64,000, which is less than half the current list price of a new car.
Although there have been minor design tweaks and equipment upgrades, the D5 S8 is largely unchanged – including the same 563 hp twin-turbo V8 and sub-four-second 0-60 mph capability. This means you get all the performance and opulence of the most powerful S8 to date for less than a new compact V6-powered 352 hp Audi S5 ($63,600 starting MSRP).
The S8 isn’t the type of car that typically gets modified, but Audi’s robust 4.0-liter V8 has massive headroom to make it the ultimate sleeper with absurd performance. Some tuners have achieved up to 1,080 hp using a single-turbo setup on stock internals. There are plenty of aftermarket specialists who can easily and affordably transform this sleek and unassuming sleeper into a sizzling street weapon that will embarrass seriously quick supercars on the drag strip.
But even in completely stock form, the S8 remains an understated and underrated performance bargain, combining limousine levels of space and luxury with enough effortless shove to embarrass cars that are considerably more brash and crass. It doesn’t look like it’s spoiling for a fight, which is precisely why it’s so much fun when it picks one. And who doesn’t love an underdog?
Sources: Audi, BMW, Mercedes-Benz, Good Car Bad Car, Motortrend, Car & Driver
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