Watch out, BMW M4 GTS!
The letter "R" looks set to strengthen its position as the most powerful one in Mercedes-AMG's alphabet.
Following the GT R supercar, the automaker is cooking another "R" model, based on the C63 Coupe. We know that because our spy photographers have caught on camera one pumped-up C63 Coupe test car flexing its muscles on the Nürburgring Nordschleife. While we don't know for sure that this particular C63 Coupe prototype will wear the "R" badge, it's clearly a hardcore performance variant.
The body kit is significantly more aggressive than on the regular C63 Coupe and C63 S Coupe, with the most noticeable changes including a massive rear wing, front spoiler, and black boot lid – although we're not sure the latter will survive on the production model.
There's no doubt that the engine is the 4.0-liter V8 biturbo unit, but in which state of tune? 577 hp and 516 lb-ft (700 Nm) of torque from the AMG GT R or 549 hp and 502 lb-ft (681 Nm) from the recently-unveiled AMG GT C Roadster?
Either way, it would still top the current most powerful C63 Coupe (the S) which has 503 hp and 516 lb-ft (700 Nm) of torque.
The launch date remains uncertain too, but given that Mercedes-AMG didn't bother to hide many things on the prototype, it may arrive rather sooner than later.
Image credits: AUTOMEDIA