AMG C63 facelift will reportedly feature a new plug-in hybrid powertrain with a six-cylinder engine. It would replace the current turbocharged 2.0-liter four-cylinder that produces a combined 671 hp.

Downsizing the engines of performance cars is never a crowd pleaser, but few decisions have proved quite so unpopular as Mercedes-AMG ditching the C63’s V8 and replacing it with a four-cylinder ...