Not a lot of things are cooler than an undercover performance car that can outrun sports cars at the push of the gas pedal. These so-called sleeper cars trace their roots farther than most gearheads realize. One of the first famous examples is the 1949 Oldsmobile Rocket 88, which paired a lightweight sedan body with a high-compression 303 V8, winning NASCAR races left and right. In the ‘60s, manufacturers like Chevy started secretly offering the biggest and baddest engines reserved for their race cars in everyday grocery getters through special orders for customers who knew which boxes to tick. In the ‘80s, Buick built America’s fastest car with the GNX, but understated its performance to protect the Corvette’s image. By the time the '90s rolled around, European luxury brands had plenty of unassuming sports sedans like theAMG Hammerand the BMW M5 in their lineups.Today, sleeper cars have their own following and are just as cool as any exotic or muscle car among gearheads in the know. The ability to catch people on the streets off guard with its performance is the hallmark of every great sleeper, but of course, some sleepers are more unexpected than others. The following ten sleepers all made it onto this list because they punched way above their weight by delivering sports-car-rivaling performance in the most boring bodies possible. Most people could never tell these cars were fast just by looking at them. The best part? Many of these cars are still not common knowledge among gearheads and, as a result, represent serious bargains on the used market. Mazdaspeed6 Power: 274 HP Bring A TrailerIn the mid-2000s, Mazda randomly decided to put a 274-hp turbo inline-4 into a midsize economy sedan, creating one of Japan’s greatest sleeper sedans in the process. It may not sound that impressive today, but back in the day, the Mazdaspeed6 was the textbook example of a car that punched far above its weight.When it hit the streets in 2006, it carried a $27,995 MSRP, which made it about as expensive as aMazda’s RX-8 sports car. However, the Mazdaspeed6 had a solid 42 hp advantage over the sports car and rocketed to 60 mph around a second quicker. It even made the standard Subaru WRX look slow, and yet only gearheads in the know were buying them. Sadly, it only ran for two years until 2007 before Mazda pulled the plug. Two decades later, the Mazdaspeed6 remains a true bargain sleeper, with buyers paying roughly $6,525 for these sedans in 2026, according to J.D. Power. 2013-2017 Honda Accord V6 Power: 278 HP Cars & BidsHonda offered a V6 in their Accord midsize sedan all the way up until 2017, when the final 9th-gen Accord left the factory. Equipped with a 3.5-liter VTEC V6, these are still the most powerful Accords one can buy, pushing 278 horsepower and 262 pound-feet to the front wheels – and they look virtually identical to the standard models. That power translates to a 0-60 of 5.6 seconds. But the Accord also comes in a coupe version, which trims that time down to the mid-5s with a manual transmission. This happens to be the most sought-after combination among enthusiasts on the used market, too. As a cherry on top, 9th-gen V6 Accords also have a strong reputation for reliability, with RepairPal estimating its annual maintenance at only $316, and many owners on forums boasting about their high-mileage Accords. Volvo V70R Power: 300 HP VolvoThe Volvo V70R is one of the biggest sleepers ever built, its exterior design providing exactly zero clues to its true performance. However, under the hood, the V70R hides a special 300-horsepower turbocharged inline-5 with two intercoolers sending 300 horsepower and 295 pound-feet of torque to all four wheels. Those were Subaru WRX STI figures when the Volvo was new in 2004, and enough for a 0-60 in just 5.4 seconds and a top speed of 155 mph. That extra traction, combined with a special Öhlins suspension, also makes it a track day weapon. This ultimate sleeper status is keeping values on the used market relatively strong. The 5-speed automatic versions trade for around $14,000, but the more desirable 6-speed manuals are already worth well over $23,000. Ford Fusion Sport Power: 325 HP FordThe 2017-2019 Fusion Sport is Ford’s last attempt at a sporty sedan ever, and for those of us who know about it, it’s truly a sleeper car masterclass. Ford gave it a 2.7-liter twin-turbo V6 and hooked it up to all-wheel-drive with adaptive dampers on all four corners. The result is a 0-60 mph time of5.1 seconds, which made the Fusion Sport quicker than many sports cars like theNissan 370Z. Except it still looked barely any different from a standard Fusion – a car that was designed to go up against economy sedans like the Toyota Camry, Kia Optima, and Chevy Sonata. Being such an under-the-radar option may have played against the Fusion Sport’s favor. Fewer than 11,000 buyersticked the Sport option, and Ford eventually gave up and axed the model from its lineup in 2019. Lotus Carlton Power: 377 HP Jay Leno's Garage YouTubeSleeper cars don’t get much cooler than the Carlton. In the late ‘80s, Lotus took a standard Vauxhall Carlton economy sedan and bored out its 3.0-liter inline-six to 3.6 liters and bolted on two turbos. The result was a staggering 377 horsepower and 419 pound-feet of torque, which made the Carlton the fastest four-door sedan when it hit the streets in 1990. With a 0-60 in 5.1 seconds and a top speed of over 177 mph, it was faster than a Ferrari Testarossa or a Lamborghini Countach LP400.Wrapping that kind of speed in a boring executive sedan body made the Lotus Carlton a tempting getaway car for criminals, easily outrunning police patrol cars that had no hope of keeping up. The most famous story involves a stolen Carlton with the registration 40 RA, which was used for a string of brazen thefts spanning several weeks in ‘93. British Media outlets soon started calling for the car to be banned, deeming it too dangerous for public roads. Lotus discontinued the model in 1993 after just 950 units had been produced. Chevrolet SS Power: 415 HP ChevroletArguably the greatest modern American sleeper sedan, the Chevy SS never really got the credit it deserved when it was on the market. Fewer than 13,000 units have left the factory between 2014 and 2017, all with the venerable 6.2-liter LS3 V8 – a detuned version of the same V8 you’d get in a Camaro SS or a Corvette C6.Pushing 415 horsepower to the rear wheels, the Chevy SS rockets to 60 mph in 4.1 seconds under ideal conditions, matching or even exceeding the performance of most sports sedans of its era, including far more expensive ones like the BMW M340i. It didn’t just punch above its weight when it comes to performance; it was surprisingly well equipped, too, featuring a full leather cabin with Magnetic Ride Control, HUD, and heated and ventilated seats. You could get it with either a six-speed manual or a 6-speed automatic transmission, but manual versions are now worth more on the used market. Infiniti Q50 Red Sport 400 Power: 400 HP Via: InfinitiNissan's luxury arm Infiniti has its own performance model that uses the same exact V6 as the new Nissan Z – a 400-horsepower twin-turbo 3.0 VR30DDTT V6. Except, in the Q50 Red Sport 400, buyers can pick between an RWD and an AWD version, and there’s no manual-transmission option. Still, 60 mph happens in just 4.5 seconds, while Infiniti’s Dynamic Digital suspension and torque vectoring help it take on corners like a proper sports sedan. The best part? Despite being relatively new luxury sedans and packed full of features, these 400-horsepower sleepers are surprisingly affordable on the used market. The average price buyers are paying is just about $24,000, says J.D. Power, and it will compete with $50,000 luxury sports sedans all day long. 2017-2020 Lincoln MKZ (AWD) Power: 400 HP LincolnLincoln’s motto nowadays is "Quiet Luxury," but the MKZ might have taken the notion a bit too far. Despite looking like an accountant's car or something you'd see in a retirement community parking lot, this midsize sedan offers a twin-turbocharged 3.0-liter EcoBoost V6 that makes 400 horsepower and 400 pound-feet of torque if you get it with optional AWD. With power going to all four wheels, one of America’s most boring-looking sedans launches to 60 mph in 4.8 seconds. As if that weren’t impressive enough, adaptive suspension and torque vectoring make this a proper hidden sports sedan that will easily handle tight corners too.Fun fact: you can get the MKZ with an optional panoramic sunroof that slides over the rear windshield and gives you an amazing open-air experience to go along with the massive power. The best part? Used twin-turbo MKZs are totally slept on (pun intended), trading on averagebetwen $10k and $20k. Audi S6 (C6) Power: 435 HP Bring A TrailerIt’s been 20 years since the C6 Audi S6 dropped, and it’s still one of the craziest cars the brand has ever made. Part of the reason lies in the monster 5.2-liter V10 with Lamborghini DNA that has no place in a midsize Audi sedan. The other part is the fact that the S6’s design doesn’t even give the slightest clue about what’s hiding under the hood. That combination makes it the ultimate sleeper. It produces between 429 and 435 horsepower, depending on the model year, channeled through a six-speed Tiptronic to all four wheels via Audi's famous Quattro AWD system. With near-infinite grip and massive naturally aspirated power, this civilized-looking sedan is quicker than an Audi S8 that used the same engine, reaching 60 mph in 4.8 seconds. Jeep Grand Cherokee Trackhawk Power: 707 HP Via: Mecum AuctionsIf you thought a Jeep could never be a sleeper car, the Trackhawk is here to dispel that notion completely. Chrysler's wild decision to add the 707-horsepower Hellcat V8 option to the 2018 Grand Cherokee spawned a family SUV that should never have existed. With power going to all four wheels, the Trackhawk will beat pretty much everything short of a supercar to 60 mph, completing the run in just 3.5 seconds. Heck, the added traction gives it more shove off the line than a Challenger Hellcat, which takes two tenths of a second longer to 60 mph. Brembo brakes and adaptive suspension help this 5,448-lb SUV handle like something way smaller.The model only lasted until 2021, but this wild once-in-a-lifetime combination of American power and luxury is now starting to gain serious traction on the used market. Collectors are currently paying around$81,497 on average, but values seem to be steadily rising, with more and more Trackhawks fetching north of six figures every month, according to Classic.com data.Sources: Classic.com, Car and Driver, Motor Trend, J.D. Power, Kelley Blue Book, RepairPal.