The wider body has been developed to house a revised chassis featuring unique tracks both front and rear. It also permits the fitment of standard 255mm wide tyres up front and 285mm rubber at the rear. The previous model ran on 235mm front and 255mm tyres. The wheels sizes vary according to model, with the new C63 receiving 18in rims and the C63 S 19in alloys.
Typical AMG styling touches include a heavily structured front bumper with a black insert and integral front splitter, a prominent grille featuring an oversized three-pointed star emblem, 'V8 turbo' identification along the flanks, black exterior mirror housings, beefed up side sills, subtle boot deck spoiler, uniquely designed rear bumper and four trapezoidal-shaped tail pipes integrated into the rear valance and diffuser element.
Inside, there are AMG-specific instruments, controls, gear lever and trim applications, along with a flat-bottom multi-function steering wheel and sports seats. Buyers can specify more heavily contoured optional performance seats, which allow a lower seating position.
As with the latest C63 saloon and estate, the C63 Coupé will be sold with the choice of two power outputs. In standard guise its twin-turbocharged 4.0-litre V8 engine, known under the internal codename M178, develops 469bhp and 479lb ft.
In the headlining S model, which receives dynamic engine mounts, the reserves are increased to 503bhp and 516lb ft through increased boost pressure and changes to the inlet manifold, giving it exactly the same power output but 37lb ft more torque than the Mercedes-AMG GT S.
With a kerb weight of 1725kg, the new C63 S Coupé tips the scales 70kg above its predecessor, owing mainly to its increased dimensions. But with an additional 23bhp, it offers a marginally improved power-to-weight ratio at 292bhp per tonne versus 290bhp per tonne for the old C63 Coupé with Performance Package.
Drive is channelled through AMG’s seven-speed Speedshift MCT (MultiClutch Transmission) automatic gearbox fitted with a shorter final drive than in the C63 saloon and estate. In the standard C63 Coupé it operates in combination with a mechanical locking differential, but in the C63 S it is allied to a faster reacting electronic locking differential.
As with the C63 saloon and estate, the driver can choose between four different driving modes on the C63 Coupé and up to five on the C63 S Coupé. The new M4 rival’s switchable electronic stability control system also offers three distinct settings: On, Sport and Off.
In standard C63 Coupé guise, AMG’s latest model possesses a claimed 0-62mph time of 4.0sec – making it 0.1sec faster than the C63 saloon and 0.2sec faster than the C63 estate.
Despite the wholesale lift in performance, AMG claims the new C63 AMG Coupé is significantly more economical than its predecessor with an official consumption figure of 32.8mpg for both models and corresponding CO2 emissions of 200g/km.
Underpinning the new C63 Coupé is a heavily reworked version of the C-Class Coupé’s chassis featuring a four link front and multi-link rear suspension. It receives new steering knuckles, wider tracks, a unique rear axle carrier which moves the contact surface of the rear wheels 25mm outwards of that of the C63 saloon and estate, stiffer elastokinematics and greater negative camber. The dampers are adjustable in three stages at the press of a button.