One look at the Mercedes-AMG C63 and you will be forgiven if you mistook it for a C250 AMG Line. The new C63 is perhaps the very definition of a sleeper as very little separates it from the AMG Line C-Class and the only giveaway are the subtle quad exhaust pipes at the back. Under the hood is a completely different story. This go-fast D-Segment sedan packs a biturbo 4.0 liter V8 that puts out more power than its naturally aspirated predecessor. Go for the C63 S and you get even more power to decimate your rear tires even faster.