The Mercedes S63 AMG Coupe was recently spied during testing on public roads. This S63 AMG Coupe prototype is completely covered in camo tape, but you can get a general idea bout it design by checking out the S Class Coupe concept revealed back in September. The Mercedes S63 AMG Coupe is going to replace the CL63 AMG and it is going to be powered by the 5.5-liter V8 engine. This means that the S63 Coupe is going to have an output of 585 bhp and 900 Nm of torque.