With 476 PS and 650 Nm (479 lb-ft) of torque on tap, the C63 Estate is already one of the world's fastest people haulers.
Thus, you're able to get all the practicality of a station wagon and at the same time never be sort of power when you press down the right pedal.
However, some enthusiasts like their cars to be as powerful as possible, regardless of shape or segment. With that in mind, tuning company Wheelsandmore took this car from its original power and torque outputs and brought it up to 620 HP and 820 Nm (605 lb-ft) - which is where the '6.8' comes from.
Accorting to Autogespot, this comes from replacing the turbos and downpipes as well as the exhaust system. The result is a top speed of 300 km/h (186 mph) and a 0-100 km/h (62 mph) acceleration time of 3.6 seconds, or about half a second quicker than the standard C63 Estate, or even the C63 S for that matter.