Here are some fresh spy shots of a partially camouflaged prototype of Mercedes' answer to the latest BMW M3 sedan , the next generation performance version of the C-Class that will hold on to the C63 AMG moniker, even though Benz has replaced the naturally-aspirated 6.2-liter V8 with a downsized, but twin-turbo'd, 4.0-liter V8 . Read more »
