10 Ridiculously Fast Sleepers More Gearheads Should Know About

The sleeper car is one of motorsport culture’s most enduring fantasies: a machine that looks utterly unremarkable until the moment it embarrasses something far more exotic at a stoplight. That gap between appearance and ability never gets old — and the cars that pull it off best deserve to be celebrated, not forgotten.

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We’ve compiled a list of ten ridiculously fast sleepers more gearheads should know about and ranked them all according to their top speeds. Every one of these cars deserves recognition. If anything, they deserve far more praise than they typically get!

Mercury Marauder (2003)

Top Speed: 117 mph (limited)

Specs

Engine	Read Also 3 week ago New Safety Coach app helps Volvo drivers build safer habits and lower insurance rates 27 autotech 4.6-liter V8
Transmission	4-speed automatic
Power	302 hp
Torque	318 lb-ft
Top Speed	117 mph (limited)
Drivetrain	Rear-wheel drive

Source: Mercury

The Ford Panther platform gave us a lot of great cars over its lifetime. Many of these were plush, luxurious sedans that tended to be driven by retirees. The third-generation Mercury Marauder doesn’t fit that stereotype, though. A development of the Mercury Grand Marquis of that era, the Marauder was intended to be a serious performance sedan. It was the most powerful Panther-bodied car of its day, with 302 hp and 318 lb-ft of torque from a 4.6-liter V8. It also looked more the part, ditching the Grand Marquis’s chrome trim for a sleeker, less ostentatious appearance.

The Marauder had a factory-imposed top speed of 117 mph, ostensibly to prevent driveshaft vibration. However, owners have long insisted the car is capable of well beyond that. One Marauder owner claimed to have pushed his to “a little above 155 mph” on the banking at Michigan International Speedway.

Mitsubishi Galant VR-4 (1987)

Top Speed: 130 mph

Specs

Source: Mitsubishi

In most of its guises, the Mitsubishi Galant was an ordinary family sedan or wagon. The Galant VR-4, however, is a very different story. It was originally built as a homologation special so that Mitsubishi could race it in the World Rally Championship. As a result, it packs a turbocharged 2.0-liter engine producing 237 hp and 224 lb-ft of torque, along with a sophisticated all-wheel drive system. That combination was enough to take the Galant VR-4 from 0–60 in 7.3 seconds and on to a top speed of 130 mph — not bad at all for something that started life as a reliable everyday family car.

The Mitsubishi Galant VR-4 has slipped into obscurity in recent years, overshadowed by rally-inspired cars that came later, such as the Lancer Evolution. But it’s still a great performance sedan for its era, and more gearheads should know about it.

Acura RL SH-AWD (2005)

Top Speed: 155 mph (limited)

IFCAR, via Wikimedia Commons

Specs

Source: Acura

From the outside, the Acura RL SH-AWD (also known as the Honda Legend) looks like something your grandpa would drive; absolutely nothing about it screams high performance. But that’s something this car surprisingly seems to have. Under the hood of this sedate-looking sedan is a 3.5-liter V6 with Honda’s legendary VTEC system, producing 290 hp and 260 lb-ft of torque. That power is channeled through a sophisticated all-wheel drive system designed to give it sharper handling than other executive sedans of the time. The result: a 0–60 time of 6.7 seconds according to Car & Driver, with a limited top speed of 155 mph.

The Acura RL SH-AWD isn’t the most exciting choice. It’s certainly pretty drab to look at. But it’s far from slow, it handles well, and it’s a sleeper sedan that shouldn’t be overlooked.

Pontiac G8 GXP

Top Speed: 155 mph (limited)

Specs

Source: Pontiac

Despite being a four-door sedan, the Pontiac G8 GXP was the most powerful muscle car Pontiac ever built. The G8 was a rebadged captive import of the Holden Commodore, specifically the VE generation, assembled at Holden’s plant in Elizabeth, Australia before being exported to North America. It only lasted for the 2008 and 2009 model years — General Motors scrapped the Pontiac brand in 2009 as part of its bankruptcy restructuring, and the G8 was a casualty of that decision.

The G8 GXP came with the 6.2-liter V8 sourced from the Chevrolet Corvette, producing 415 hp and 415 lb-ft of torque. That was enough to take the G8 GXP from 0–60 in 4.7 seconds and up to a limited top speed of 155 mph. That apparently wasn’t the ceiling, either. Pontiac engineers claimed the G8 GXP could reach as high as 185 mph from the factory.

Audi S6 (2006)

Top Speed: 155 mph (limited)

via Audi

Specs

Source: Audi

The Audi S6 is another car that doesn’t look like a true sleeper — but it’s a performance sedan that a lot of people have forgotten about. Specifically, they’ve forgotten about the remarkable engine under the hood. The S6 from this generation (known as the C6) used the same 5.2-liter V10 found in the Audi R8 V10 and the Lamborghini Gallardo of the day. That translated to 429 hp, 398 lb-ft of torque, and a glorious V10 soundtrack. Despite its size as a large executive sedan, the C6 S6 reached 60 mph in the mid-5-second range and topped out at a limited 155 mph. Remove the limiter, and owners claim speeds of 180–190 mph become possible.

More gearheads really should know about the C6-generation Audi S6. If nothing else, they should be aware that it shares its engine with a Lamborghini.

VW Phaeton W12 (2004)

Top Speed: 155 mph (limited)

Specs

Source: Volkswagen

The VW Phaeton is one of the most unusual creations to ever come out of the VW Group. Sharing a large amount of its components with the Bentley Continental GT and the Bentley Flying Spur, the Phaeton was a massively over-engineered super-luxurious sedan. It also offered one of the VW Group’s most extraordinary engines as an option: the 6.0-liter W12, essentially created by fusing two VR6 units together. This giant engine produced 444 hp and 413 lb-ft of torque — enough to hustle this big, heavy car from 0–62 in 6.1 seconds and on to a limited top speed of 155 mph.

The Phaeton has largely been forgotten today. Those who do remember it often view it as an expensive failure. But the top-of-the-line W12-engined version could be one of the greatest sleeper cars ever made.

Audi A8 L W12 (2005)

Top Speed: 155 mph (limited)

M 93, via Wikimedia Commons

Specs

Source: Audi

Most people associate the 6.0-liter W12 engine with the Bentley Continental GT or the VW Phaeton. What you might not have known is that the Audi A8 could be had with the W12 as well — it was the top engine option for the extended-wheelbase A8 L variant. In that application, the W12 produced 444 hp and 428 lb-ft of torque, sprinted from 0–62 in 5.1 seconds, and reached a limited top speed of 155 mph.

While the Audi A8 and A8 L are well-known staples of the luxury sedan segment, many enthusiasts aren’t even aware the A8 L was available with the W12. That makes it a genuine hidden gem — especially for anyone hunting a true sleeper with serious pedigree.

Chevrolet SS (2014)

Top Speed: 160 mph (limited)

via Bring a Trailer

Specs

Source: Chevrolet

The most underrated Chevrolet performance car ever, the Chevrolet SS was the spiritual successor to the Pontiac G8 GXP. In fact, it was so much of a spiritual successor that it was also a captive import of the Holden Commodore — specifically a rebadged Holden Commodore SS-V Redline from the VF generation. It carried over the G8’s 6.2-liter LS3 V8 as well, though this time the top speed limiter was raised to 160 mph. Motor Trend recorded a 0–60 time of 4.6 seconds for the 2014 SS, making it marginally quicker than the Pontiac G8 GXP it replaced.

Like the G8 GXP before it, the Chevrolet SS has faded from public consciousness over time — and that obscurity has pushed it firmly into sleeper territory. It’s a shame, because it’s a genuinely brilliant performance sedan that more gearheads should have on their radar.

Jaguar XJR575 (2018)

Top Speed: 186 mph

Specs

Source: Jaguar

The regular Jaguar XJR is already a great sleeper car. The XJR575 takes that to a whole other level. Nobody would suspect that this subtle-looking executive express packs the performance it does. Its supercharged 5.0-liter V8 puts out 575 hp (as the name suggests) and 516 lb-ft of torque, good for a 0–60 time of 4.2 seconds and a top speed of 186 mph. That’s enough to genuinely worry dedicated sports cars, all while carrying multiple adults in supreme luxury.

The Jaguar XJR is a car gearheads should already know about. The XJR575 is an even rarer gem — and that’ll only become more apparent as these cars begin attracting serious collector interest.

BMW M760i xDrive (2019)

Top Speed: 155 mph (with normal limiter), 189 mph (with upgraded limiter)

BMW

Specs

Source: BMW

The M760i xDrive was BMW’s last V12-powered production car. It sat at the very top of the 7 Series range when new, and its performance was capable of embarrassing proper sports cars. Its 6.6-liter twin-turbocharged V12 produced 600 hp and 627 lb-ft of torque in US-market specification, launching it from 0–62 in 3.7 seconds. Top speed was either 155 or 189 mph depending on whether you opted for the upgraded speed limiter — the latter giving drivers a little more room to explore what the V12 could really do. All of that capability, wrapped in what was supposed to be BMW’s ultimate expression of luxury.

Given that the M760i xDrive truly was the swan song of the BMW V12, it’s remarkable how quickly it has faded into relative obscurity. Perhaps that will change as these cars become collectible. For now, it remains a luxury sleeper that far more gearheads should know about.