2027 Mercedes-AMG CLE 646 Spezialanfertigung Goes Rear-Drive
The 2027 Mercedes-AMG CLE 646 Spezialanfertigung takes a rather different approach to improving a luxury coupe. AMG replaces the CLE 53’s all-wheel-drive hardware with rear-wheel drive, installs a 637-hp twin-turbo V8, and removes rear seats, sound insulation, and several convenience features. It also gives the car adjustable track hardware and substantially wider bodywork. Just 30 examples will leave AMG’s Affalterbach headquarters, and buyers claimed every one before its public debut.
This road-legal coupe began as a prototype assembled by a small engineering team, rather than a conventional model-development assignment. Although the Mercedes-AMG CLE 53 supplies the underlying platform, AMG modifies the structure, suspension, drivetrain, and body extensively enough that Spezialanfertigung, roughly meaning special construction, describes more than an equipment package.
A Familiar Roofline Above Unfamiliar Proportions
The CLE’s flowing roof and relatively clean side profile remain recognizable, but the new front end changes its expression considerably. A tall grille with vertical bars occupies much of the nose, while a hood intake, deep lower openings, and small aerodynamic vanes compete for the remaining space. To my eye, the widened fenders integrate more neatly than that enormous grille. They give the coupe a planted stance without entirely obscuring its original shape.
AMG adds 2.4 inches of width across both the front and rear sections, increases the track widths, and reinforces the underlying body. The finished car measures 194.8 inches long, 78.2 inches wide, and 55.9 inches tall, with a 113.2-inch wheelbase. Those dimensions leave little doubt that this remains a substantial coupe, despite its track-oriented equipment.
2027 Mercedes-AMG CLE 646 Spezialanfertigung
Carbon fiber accounts for much of the exterior transformation. AMG uses it for the vented front fenders, front fascia, side sills, centrally vented hood, roof, and rear apron with its diffuser. The reinforced trunk lid and rear wing also use the material. Two trapezoidal supports hold the wing well above the deck, interrupting the otherwise smooth roof-to-tail transition. Four exhaust outlets and a deeply sculpted lower bumper give the rear a similarly purposeful appearance.
The two-tone finish divides the body at the B-pillars, with Mojave Silver Magno ahead of that point and Obsidian Black Magno behind it. The darker rear section visually softens some of the added bulk, although the wing remains impossible to overlook. AMG crests appear on both doors, while the intricate forged wheels provide a lighter-looking contrast to the heavy body surfaces.
The 646 Badge Explains the Horsepower Math
The Mercedes-AMG CLE 646 Spezialanfertigung uses the M177 EVO V8, displacing 3,982 cc, or approximately 4.0 liters. Its two turbochargers help produce 637 hp at 6,000 to 6,250 rpm and 627 lb-ft of torque from 2,500 to 4,500 rpm. The badge reflects the engine’s 646 PS metric horsepower rating, not its U.S. horsepower figure.
AMG specifies a flat-plane crankshaft to reduce rotating mass and help the engine gain revs more readily. Dedicated engine calibration also targets throttle response. An integrated starter-generator supplies a separately rated 23 hp and 151 lb-ft; those figures should not simply be added to the V8’s ratings to create an assumed combined output.
Three cooling circuits support the powertrain. One high-temperature loop serves the engine, while two lower-temperature circuits manage charge-air cooling, transmission oil, and the 48-volt components. AMG increases their capability for sustained circuit driving and high ambient temperatures, where managing heat matters as much as producing a strong peak horsepower figure.
A model-specific exhaust increases flow capacity and uses titanium extensively to reduce weight. Akrapovič helped develop its downstream section. AMG also tuned the exhaust’s sound, although removing cabin insulation should make the engine’s presence harder to ignore regardless.
All the Power Goes Through Two Tires
AMG removes the donor car’s Performance 4MATIC+ system entirely. An electronically managed limited-slip rear differential varies its locking action according to driving conditions, helping distribute torque between the rear wheels. Its functions include improving traction and stability, while also accommodating controlled oversteer when conditions permit.
The standard AMG SPEEDSHIFT TCT 9G remains a nine-speed torque-converter automatic. AMG DYNAMIC SELECT programs alter the drivetrain’s behavior, including whether shifts favor speed or smoothness. The transmission provides rev-matched downshifts and can execute several downshifts in quick succession. Nine ratios give it considerable flexibility to keep the V8 in a useful part of its operating range.
AMG recalibrates launch control for the rear-drive layout and quotes 0-62 mph in 3.9 seconds, 0-124 mph in 11.4 seconds, and a 193-mph maximum speed. It does not provide a separate 0-60-mph figure. Reaching 186 mph takes 36.2 seconds with the aerodynamics in Street configuration or 36.8 seconds in Race configuration, illustrating the high-speed acceleration cost of the higher-downforce setup.
For closed-course driving with ESP switched off, AMG TRACTION CONTROL offers nine selectable levels of rear-wheel slip. Drivers can choose a setting to suit tire temperature and how closely they want to approach the grip limit. This retains adjustable traction assistance without the stability-control interventions that ESP would otherwise supply.
Suspension Adjustments Beyond a Dashboard Menu
Mercedes-AMG and KW automotive jointly developed the steel-spring coilover suspension for the 2027 CLE 646. Its four-way adjustable dampers allow separate changes to low- and high-speed compression and rebound. Owners can tailor the setup to a particular circuit, driving style, or intended use rather than relying solely on a handful of electronic presets.
Here, low and high speed describe damper movement, not vehicle speed. Low-speed adjustments influence body motions during braking, acceleration, and corner entry. High-speed settings govern how the suspension responds to sharper wheel movements over bumps and uneven pavement. That distinction gives the adjustments practical meaning, although extracting their benefits requires more knowledge than selecting a sport mode.
AMG lowers the front by 0.9 inches and the rear by 0.6 inches. Forged 20-inch wheels measure 11 inches wide up front and 12 inches at the rear, carrying 305/30 ZR20 and 335/30 ZR20 tires, respectively. The tires build on technology developed for the Mercedes-AMG ONE, with a specification exclusive to this CLE. Additional body reinforcements and an integrated roll bar increase torsional rigidity, giving the suspension a stiffer structure to work against.
The ceramic-composite brakes use internally ventilated, drilled rotors measuring 16.5 by 1.6 inches at the front and 14.2 by 1.3 inches at the rear. Six-piston fixed front calipers and single-piston floating rear calipers wear gold paint. AMG’s long-fiber technology in the front discs helps move heat from the friction surfaces toward the internal cooling passages, reducing brake-pad temperatures.
Large front openings and dedicated air guides supply additional brake cooling. Compared with a conventional brake arrangement, the ceramic system also cuts weight and unsprung mass, reducing the load the suspension must control as the wheels move over the road.
Aero Settings Require Actual Handwork
The aerodynamic package links the front diffuser, fender vents, underbody, and rear wing rather than treating them as separate styling accessories. Drivers reposition the front diffuser manually using three fasteners, choosing between Street and track-only Race settings. Extending it creates an inverted-wing profile beneath the nose, accelerating airflow through the resulting passage and using the Venturi effect to increase front downforce.
The carbon-fiber rear wing’s center section also adjusts manually. AMG intends drivers to coordinate its setting with the extended front diffuser to establish the appropriate front-to-rear aerodynamic balance on a circuit. This is not an automatically deploying wing that changes position while driving.
Channels beside the headlights route air through the wheel arches and out through the fender louvers. Those openings relieve wheel-well pressure and contribute to downforce. Small vanes along the outer front fascia further manage airflow while helping feed the brakes.
Underneath, revised cooling arrangements allow AMG to close off nearly the entire front floor area. The underbody panels address both heat management and airflow, while lengthwise fins locally accelerate air beneath the car. AMG claims the complete package produces well over 550 pounds of downforce at the 193-mph top speed. The drag coefficient rises from 0.402 in Street form to 0.417 in Race form, consistent with the slower 0-186-mph run in the latter setting.
A Stripped Cabin That Still Looks Like a Mercedes
Inside, the basic CLE dashboard architecture survives. A digital instrument display, portrait-oriented center touchscreen, and circular vents retain a familiar Mercedes layout. Carbon-fiber door panels, fabric door pulls, and deeply bolstered racing buckets change the atmosphere more than the dashboard does. The contrast works: AMG has removed equipment without trying to disguise the car’s production origins.
The lightweight bucket seats come standard, as does the roll bar. An optional Performance Package adds six-point harnesses for both occupants. AMG deletes the rear seats and acoustic insulation, reduces comfort equipment, and simplifies the audio system. It also pares back infotainment functions and removes several assistance systems, including PARKTRONIC parking assistance.
The flat-bottom AMG Performance steering wheel uses microfiber trim for grip. There’s fewer controls on the wheel, too, because AMG eliminates some drive programs and assistance functions. That does not mean every selectable drivetrain setting disappears; the remaining AMG DYNAMIC SELECT programs still adjust powertrain behavior.
Beyond the cabin, polycarbonate replaces glass in the rear side windows and rear window, and a lighter 12-volt starter battery contributes to the weight reduction. Together with the carbon-fiber panels, titanium exhaust components, and drivetrain changes, the work removes approximately 375 pounds relative to the donor car.
Even so, AMG lists a 4,178-pound curb weight and a 56/44 front-to-rear weight distribution. The reduction is meaningful, but this is still a front-heavy, two-ton coupe rather than a lightweight in the usual sports-car sense. Its broad tires, substantial brakes, and extensive cooling equipment make sense in that context.
Thirty Cars Outside the Regular Catalog
The CLE 646 becomes the second Mercedes-Benz Mythos Series model, following the Mercedes-AMG PureSpeed. That roofless, windshield-free two-seater carries a worldwide production limit of 250 examples, making this 30-car coupe considerably rarer. AMG hand-builds each Spezialanfertigung in Affalterbach, connecting it to the company’s history of small-volume conversions such as the AMG 300 CE 6.0 Hammer.
Mercedes-Benz serves a much broader audience with models such as the GLA, G-Class, and S-Class. This project occupies a different corner of the business, combining collector-level scarcity with hardware that asks owners to engage with suspension settings, aerodynamic balance, and rear-wheel traction.
Mercedes-AMG has not specified a price or a U.S. allocation for the 2027 Mercedes-AMG CLE 646 Spezialanfertigung. With all 30 cars already spoken for, its significance lies less in expanding the CLE shopping list than in showing how extensively AMG can rework the platform. The V8 attracts attention, but the removal of all-wheel drive, adjustable chassis, and coordinated aero package make this more than an engine swap.
