About Audi RS6 Avant we can say that is something like a family Lambo. But, the tuner Reifen Koch thought that almost 600 HP is not enough for a family…
Audi RS6 Avant stock model has a huge 5.2-liter V10, borrowed from the Audi R8 V10. The thing is that the wagon has even more horsepower that the supersort coupe: 580 HP compared to the R8’s 525 HP.

In addition, the Audi RS6 Avant is even more powerful than the Mercedes E 63 AMG T-Modell, and is currently the most powerful stock wagon in the world.

“So what?” said Reifen Koch, who, like another German tuner, MTM, wanted to get more from the the RS6 Avant. We mean about 700 HP – or about 120 additional horsepower.And torque was affected too, raising from 479 lb-ft to 583 lb-ft.
The interesting fact is that this upgrade do not require major interventions in the technical side of the car. The recalibration of the Engine Control Unit, the adopting of a sport air filter and the replacement of the exhaust system were enough.
Therefore, the performances are also at another level: if the maximum speed for a stock Audi RS6 Avant is limited to 155 mph, the model tuned by Reifen Koch gets far up to 205 mph (true, with almost 10 mph less than the same car tuned by MTM). The acceleration times are not specified, however, we wonder how many tens of seconds it dropped compared to the 4.6 seconds claimed by the stock model?
As for the looks of the car, the tuner considered that is not the case to alter the car’s sober line with an aesthetic kit. Though, it is available a set of wheels of not less than 22″, coming from Schmidt, wearing performance tires, sized 265/30 R 22.
 source by mibz