Abt Sportsline recently tuned the Audi RS6 Avant to a devilish 666 HP (490 kW) but that wasn't enough for the company as they have introduced an even more powerful tuning program.

Designed to be "striking without being overbearing," the new package includes an ABT engine control unit, a sports exhaust system and "slight engine management modifications." These changes enable the twin-turbo 4.0-liter V8 engine to produce 700 HP (515 kW) and 880 Nm (649 lb-ft) of torque - an increase of 140 HP (103 kW) and 180 Nm (132 lb-ft). This enables the wagon to rocket from 0-100 km/h in 3.4 seconds and hit a top speed of up to 320 km/h (199 mph).

Despite the impressive performance, the car is relatively discreet as it can be equipped with carbon fiber mirror caps, sport springs and 20- or 22-inch ABT ER-C alloy wheels.

Source: Abt Sportsline