Mercedes-AMG has taken the CLE Coupe and transformed it into something radically more focused. The new Mercedes-AMG CLE 646 Spezialanfertigung combines a 637-horsepower 4.0-liter twin-turbo V8 with rear-wheel drive, extensive carbon-fiber construction, adjustable motorsport-inspired suspension and more than 550 pounds of aerodynamic downforce at top speed. Only 30 examples will be built, and remarkably, every one of them was already sold before the car made its world premiere.
This Is Far More Than a Faster Mercedes-AMG CLE
The name may be difficult for American enthusiasts to pronounce at first glance, but understanding the Mercedes-AMG CLE 646 Spezialanfertigung is considerably easier.
“Spezialanfertigung” essentially describes a special, bespoke creation, and that is exactly what AMG has built.
This isn’t simply a CLE with a more powerful engine, larger wheels and an aggressive body kit. AMG has extensively re-engineered the car around one overriding objective: maximum driving dynamics.
The project started when a small group within AMG asked how far the existing CLE platform could be pushed if everyday compromises were pushed aside and the emphasis shifted toward precision, weight reduction and racetrack performance.
The resulting car begins life from a CLE 53 platform, but what emerges from AMG’s Affalterbach facility is something dramatically different.
Each example is effectively rebuilt by hand.
The CLE 646 Spezialanfertigung is also the second member of the ultra-exclusive Mercedes-Benz Mythos Series, following the roofless Mercedes-AMG PureSpeed.
And AMG is making the CLE considerably rarer.
Production is limited to only 30 cars worldwide.
A 4.0-Liter Twin-Turbo V8 Replaces the CLE 53’s Six-Cylinder
The transformation begins underneath that huge carbon-fiber hood.
Instead of retaining the CLE 53’s six-cylinder powertrain, AMG installs an extensively developed version of its M177 EVO 4.0-liter twin-turbocharged V8.
In European specification, Mercedes quotes 646 PS, which explains the car’s name. In U.S. horsepower terms, output works out to approximately 637 hp.
Maximum torque stands at approximately 627 lb-ft, available between 2,500 and 4,500 rpm.
But AMG didn’t simply increase boost and call the job finished.
One of the engine’s most interesting technical changes is the use of a flat-plane crankshaft. Reducing rotating mass allows the engine to respond more aggressively and rev more freely, contributing to the exceptionally direct character AMG wanted from the car.
A specially developed high-performance exhaust system accompanies the engine. Titanium construction helps reduce weight, while the rear section was developed in cooperation with Akrapovič.
Power reaches the rear wheels through AMG’s SPEEDSHIFT TCT 9G nine-speed transmission.
Yes, rear wheels.
AMG Ditched All-Wheel Drive for Something Much More Interesting
Perhaps the most significant decision AMG made was removing the familiar all-wheel-drive configuration and sending the V8’s output exclusively to the rear axle.
That alone tells you a great deal about this car.
The CLE 646 isn’t designed to generate the easiest possible acceleration numbers under every conceivable condition. AMG wanted it to feel engaging, adjustable and alive underneath the driver.
An electronically controlled rear limited-slip differential manages the enormous output, while the Launch Control system has been recalibrated specifically for the rear-wheel-drive configuration.
The result is a modern AMG that sounds almost surprisingly old-school on paper: front-mounted V8, rear-wheel drive and a chassis deliberately designed to let an experienced driver explore the limits.
AMG even acknowledges the obvious consequence — controlled drifting is very much part of the package.
0–124 MPH Takes Just 11.4 Seconds
Despite sacrificing the traction advantage of all-wheel drive, the CLE 646 remains extremely fast.
Mercedes quotes 0–62 mph in 3.9 seconds, while 0–124 mph takes only 11.4 seconds.
Keep your foot down and the Spezialanfertigung reaches 186 mph in around 36 seconds.
Top speed is 193 mph (310 km/h).
Those figures only tell part of the story, however.
Straight-line acceleration wasn’t the primary objective. The entire vehicle has been engineered around braking, steering response, cornering stability, aero performance and communication with the driver.
This is essentially AMG’s interpretation of what a road-legal CLE track weapon should be.
AMG Removed Around 375 Pounds
Weight reduction became one of the project’s central engineering objectives.
Compared with the donor vehicle, AMG removed approximately 375 pounds (170 kilograms).
That is an enormous reduction for a modern luxury performance coupe.
The diet extends throughout the vehicle.
Carbon fiber is used extensively across the body, the rear side windows and rear window are made from lightweight polycarbonate, and AMG even installs a lighter 12-volt starter battery.
Inside, the rear seats are gone.
Sound insulation has been removed, comfort equipment has been reduced and the audio system has been simplified.
AMG also deleted various assistance systems and unnecessary controls. Even PARKTRONIC parking assistance has been sacrificed in the pursuit of a more focused driving experience.
The resulting curb weight is approximately 4,178 pounds (1,895 kg).
That’s still not lightweight in traditional sports-car terms, but considering the size, V8 powertrain and underlying CLE architecture, the amount of weight AMG managed to remove is impressive.
A Proper Adjustable Coilover Suspension Replaces the Regular Setup
The suspension is equally serious.
Mercedes-AMG worked with KW Automotive to develop a dedicated steel coilover system specifically for the CLE 646.
Rather than offering drivers a handful of electronic presets, the system uses four-way adjustable dampers.
Low- and high-speed compression and rebound can be configured independently.
That level of adjustment allows the car to be optimized for different tracks, road conditions and driver preferences in a way far beyond a conventional adaptive street suspension.
Low-speed damping primarily controls body movement during braking, acceleration and corner entry, while high-speed damping manages rapid wheel movements caused by bumps, curbs and surface imperfections.
For owners who actually intend to take one of these extraordinarily rare cars onto a circuit, that adjustability could prove invaluable.
Nine-Stage AMG Traction Control Lets Drivers Explore the Limit
AMG has also given the driver considerable authority over how the rear axle behaves.
With ESP switched off on a closed circuit, AMG TRACTION CONTROL provides nine selectable stages of intervention.
Rather than simply switching traction control completely on or off, drivers can progressively determine how much rear-wheel slip the system permits.
The concept has clear motorsport influences.
Different settings can be selected depending on tire temperature, track conditions and how close the driver wants to operate to the vehicle’s handling limits.
Combined with rear-wheel drive and the electronically controlled limited-slip differential, the system should make the CLE 646 considerably more adjustable than a conventional CLE.
Huge Carbon-Ceramic Brakes Handle Track Abuse
Slowing the Spezialanfertigung required similarly serious hardware.
The AMG Ceramic High-Performance Composite Braking System uses enormous 16.5-inch (420 mm) front ceramic discs paired with six-piston fixed calipers.
At the rear are 14.2-inch (360 mm) ceramic discs with single-piston floating calipers.
Mercedes also developed a dedicated brake-cooling system.
Large openings in the front bumper feed cooling air toward the braking components, while additional air-guiding elements help manage heat during prolonged circuit use.
Carbon-ceramic construction simultaneously reduces unsprung mass compared with conventional brakes, improving steering response and overall vehicle dynamics.
Naturally, the calipers are finished in gold.
The Body Is 2.4 Inches Wider at Both Ends
The Spezialanfertigung doesn’t exactly hide its intentions.
AMG extensively modifies and reinforces the CLE body shell, increasing structural rigidity while dramatically changing the car’s proportions.
The track is widened by approximately 2.4 inches (60 mm) at both the front and rear.
Carbon-fiber fender extensions accommodate enormous forged wheels measuring 11 x 20 inches at the front and 12 x 20 inches at the rear.
Those wheels wear equally outrageous tires.
Up front are 305/30 ZR20s, while the rear gets massive 335/30 ZR20s.
The tire technology is particularly noteworthy because Mercedes says it represents a further development of technology originally created for the Mercedes-AMG ONE hypercar.
The ride height has also been reduced by approximately 0.9 inch at the front and 0.6 inch at the rear.
Carbon Fiber Is Everywhere
Much of the aggressive appearance is functional rather than decorative.
The widened front fenders with integrated air outlets are carbon fiber.
So are the redesigned front fascia, side skirts, hood, roof, rear diffuser assembly, reinforced trunk lid and manually adjustable rear wing.
The hood incorporates a central cold-air intake, while enormous openings in the front fascia serve cooling and aerodynamic requirements.
Even the paint scheme emphasizes how unusual this car is.
The front section is finished in Mojave Silver Magno, transitioning to Obsidian Black Magno from the B-pillar rearward.
AMG crests on the doors provide another subtle indication that this isn’t a conventional production CLE.
More Than 550 Pounds of Downforce at Top Speed
The dramatic bodywork isn’t merely there to make the CLE 646 look like a race car.
AMG developed an extensive aerodynamic package capable of producing well over 550 pounds (250 kg) of downforce at maximum speed.
One of its most interesting components is the adjustable front diffuser.
When extended into its Race position, its inverted-wing profile accelerates airflow beneath the front of the car, generating a Venturi effect and increasing front-axle downforce.
The center section of the carbon-fiber rear wing can also be manually adjusted, allowing the aerodynamic balance to be modified for circuit driving.
Open louvers in the widened fenders help evacuate air from the wheel wells.
AMG even developed unusual channels beside the headlights that guide air through the wheel arches and toward those outlets.
Small aerodynamic flics around the front fascia further manipulate airflow while helping cool the brakes.
And the work continues underneath the car.
Much of the underbody is enclosed, with specially shaped longitudinal fins controlling and accelerating airflow underneath the vehicle.
The result should be considerably greater high-speed stability without relying entirely on enormous external wings.
The Interior Is Almost Shockingly Focused for a Modern Mercedes
Modern Mercedes-Benz interiors typically emphasize large displays, sophisticated assistance systems, ambient lighting, audio technology and luxury.
The CLE 646 takes almost the opposite approach.
AMG deliberately removes equipment rather than adding it.
There are no rear seats, less acoustic insulation, fewer comfort systems and a simplified sound system.
The AMG Performance steering wheel is wrapped in DINAMICA microfiber and uses a flattened motorsport-inspired design. Because several drive modes and assistance features have been eliminated, AMG was even able to reduce the number of steering-wheel controls.
Ultra-lightweight racing bucket seats come standard.
Carbon-fiber door panels reduce additional weight, while an integrated roll-over bar increases torsional rigidity.
An optional Performance Package adds six-point racing harnesses for the driver and passenger.
The overall philosophy is refreshingly straightforward: if something doesn’t make the CLE 646 faster, lighter or more engaging, AMG seriously considered whether it needed to remain in the car.
It Continues a Very Different AMG Tradition
There’s also an interesting historical connection behind the Spezialanfertigung.
Each of the 30 cars is hand-built at Affalterbach, where the CLE 53 donor vehicle is transformed into the finished CLE 646.
Mercedes-AMG sees this approach as a continuation of its tradition of producing extraordinary small-series machines — including cars such as the legendary AMG 300 CE 6.0 “Hammer.”
That comparison feels appropriate.
The Hammer was memorable precisely because it represented AMG engineers taking an existing Mercedes and pushing it far beyond what anyone reasonably expected from the original vehicle.
The CLE 646 follows a surprisingly similar philosophy, albeit with modern carbon fiber, sophisticated aerodynamics, adjustable traction control and contemporary electronics.
Only 30 Will Ever Exist — and They’re Already Gone
Perhaps the most extraordinary specification isn’t 637 horsepower, 193 mph or 335-section rear tires.
It’s the production number.
Mercedes-AMG will build only 30 CLE 646 Spezialanfertigung examples worldwide.
That makes it substantially rarer than the Mercedes-AMG PureSpeed, the first Mythos Series model, of which 250 examples were planned.
And anyone hoping to call a Mercedes dealer after seeing the CLE 646 for the first time is already too late.
Every example was sold before the car’s official world premiere.
That effectively guarantees the Spezialanfertigung will be one of the rarest AMG road cars of the modern era.
The CLE 646 Feels Like AMG Engineers Were Finally Allowed to Go Wild
Perhaps that’s what makes this car so fascinating.
Mercedes-AMG didn’t merely chase a huge horsepower figure. In fact, plenty of modern performance cars produce more power.
Instead, the engineers attacked nearly every component that determines how a car behaves.
They removed all-wheel drive. They eliminated roughly 375 pounds. They installed a flat-plane-crank V8. They widened the tracks. They fitted huge tires derived from AMG ONE technology. They developed manually adjustable aerodynamics, four-way adjustable coilovers, nine-stage traction control and enormous carbon-ceramic brakes.
Then they removed rear seats, sound insulation and driver-assistance technology.
The result sounds almost like the antithesis of the increasingly complex modern luxury performance car.
The Mercedes-AMG CLE 646 Spezialanfertigung is expensive, extraordinarily rare and almost certainly destined to become a collector car.
But underneath all of that exclusivity sits something much more interesting: a modern AMG built around the simple idea that driving should still be the most important part of a high-performance car.
