Mercedes-AMG Built A BMW M4 Killer You’ll Never Actually Own
Mercedes-Benz-AMG has revealed the CLE 646 Spezialanfertigung, a 637-hp, rear-wheel-drive coupé handcrafted in Affalterbach and limited to just 30 examples worldwide — all of which sold out before the car even made its public debut. Built on the CLE 53 platform but reimagined from the ground up as a complete performance system, it sits in the Mythos Series alongside the roofless, windscreen-free AMG PureSpeed as one of the most exclusive road-legal cars the brand has ever produced.
The target is unmistakable. A wide-body stance, 375 pounds stripped from the donor car’s curb weight, pure rear-wheel drive, and a purpose-developed coilover suspension tuned for both winding roads and closed circuits — this is AMG’s answer to the 2025 BMW M4 CS and beyond, delivered in the most irrational, hand-built way possible.
A V8 With A Flat-Plane Crank and 627 lb-ft of Torque
The M177 EVO 4.0-liter V8 biturbo at the heart of the CLE 646 produces 637 hp at 6,000–6,250 rpm and 627 lb-ft of torque across a broad 2,500–4,500 rpm band. The flat-plane crankshaft — a deliberate choice over the more common cross-plane layout — reduces rotating mass and sharpens throttle response in ways that matter most when you’re threading a fast corner on a closed circuit.
Three separate cooling circuits manage thermal load: a high-temperature loop for the engine itself, and two low-temperature circuits handling charge air, transmission oil, and the 48-volt integrated starter-generator components. The exhaust system was developed in collaboration with Akrapovič, with extensive titanium construction contributing to the weight reduction target. AMG says the sound signature was engineered with a deliberate emotional focus — which, for a V8 with this much headroom, is exactly the right priority.
With the 4MATIC+ all-wheel-drive system deleted entirely, power goes exclusively to the rear axle through an AMG SPEEDSHIFT TCT 9G transmission and an electronically controlled limited-slip differential. The result: 0–62 mph in 3.9 seconds, 0–124 mph in 11.4 seconds, and a 193 mph top speed.
Wide Body, Carbon Everywhere, and a KW Coilover Setup
The body modifications go well beyond a visual package. AMG widened the bodyshell by 2.4 inches at both axles, enabling 11-inch-wide front wheels and 12-inch-wide rears, both on 20-inch AMG Performance forged rims. Tire sizes are 305/30 ZR 20 up front and 335/30 ZR 20 at the rear — rubber derived from technology originally developed for the AMG ONE hypercar, and exclusive to this car.
Carbon fiber covers the widened front fenders, hood, roof, side sills, rear apron, diffuser, and trunk lid. Rear side and rear windows are polycarbonate. The roll bar is integrated into the bodyshell, increasing torsional rigidity alongside additional structural reinforcements throughout. Ride height drops 0.9 inches at the front and 0.6 inches at the rear.
The suspension is a steel-sprung coilover system co-developed with KW automotive, featuring four-way adjustable dampers with independently configurable low-speed and high-speed rebound and compression settings. The front diffuser adjusts manually between Street and Race positions via three fasteners, and the carbon rear wing’s center section is similarly adjustable. At top speed, the aerodynamic package generates more than 550 pounds of downforce. Ceramic brakes — 16.5-inch discs with six-piston fixed calipers up front, 14.2-inch discs with single-piston floaters at the rear — handle the stopping.
Stripped Interior, Nine-Stage Traction Control, and No Parking Sensors
Inside, the rear seats are gone. Acoustic insulation is gone. The parking assistant is gone. What remains is a microfiber steering wheel with a motorsport-inspired flat bottom, ultra-lightweight racing bucket seats with pronounced lateral bolstering, carbon fiber door panels, and a simplified sound system. Six-point harnesses are available as part of an optional Performance Package.
For track sessions with ESP switched off, AMG TRACTION CONTROL lets the driver dial in rear-axle slip across nine stages — a setup calibrated specifically for the CLE 646’s rear-drive layout and the power on offer. The number of controls on the steering wheel has been reduced to match the stripped-back system architecture. AMG’s description of the development process is telling: a small group of engineers built a prototype first, driven by an internal idea rather than a product brief. Dr. Stefan Weckbach, AMG’s chairman, called it “highly rational engineers dreaming of a highly irrational car.”
The exterior finish pairs Mojave Silver Magno on the front section with Obsidian Black Magno from the B-pillar back, separated by AMG crests on both doors. Curb weight lands at 4,178 pounds — heavy by pure track-car standards, but remarkable given the CLE platform it started from. All 30 examples are spoken for. The Mythos Series, it turns out, doesn’t wait for a world premiere to sell out.
For the 30 buyers who secured one, the CLE 646 Spezialanfertigung is the purest AMG road car since The Hammer. For everyone else, it’s a reminder that Affalterbach still builds cars the way it always has — one at a time, by hand, and entirely on its own terms.
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