The Audi A6 C4 S6 4.2 Avant Plus was produced for the 1997 model year in limited quantities.
It had a displacement of 4.2 liters and used a 40-valve V8 engine.
The V8 engine produced 300 horsepower at 6800 rpm.
The S6 featured a Quattro all-wheel-drive system with a self-locking center differential.
The Avant Plus had a boot capacity of around 1,500 liters with the rear seats folded.
It came equipped with a Tiptronic semi-automatic transmission and a manual transmission option was also available.
The vehicle's top speed was electronically limited to 250 km/h (155 mph) for safety reasons.
The S6 Avant Plus had a curb weight of around 1,750 kg (3,853 lbs).
It featured a unique set of 17-inch forged alloy wheels as standard.
The interior trim and upholstery were upgraded with premium materials, including leather and aluminum accents.
The vehicle's advanced driver assistance systems included ABS, traction control, and an electronic stability program.
The S6 Avant Plus was one of the first production cars to feature a dual-stage airbag system as standard.
It had a 0-100 km/h (0-62 mph) acceleration time of around 5.7 seconds.
A limited-edition "S6 Plus" variant with sport-tuned suspension, 19-inch wheels, and unique styling cues was also produced.
The vehicle's exterior dimensions included a length of 4,860 mm (191 in), a width of 1,810 mm (71 in), and a height of 1,460 mm (57 in).
It had an overall fuel capacity of around 90 liters (24 gallons).
The S6 Avant Plus was priced from around €83,000 (approximately $93,000 USD) when new.
Only 2,250 units of the C4 S6 were produced worldwide during its production run.
The vehicle's warranty covered the engine and drivetrain for up to 100,000 km (62,000 miles).
The Audi A6 C4 S6 Avant Plus was phased out in late 1997, with the updated A6 C5 model taking over as the flagship model.
In its final year of production, the vehicle's price dropped to around €74,000 (approximately $83,000 USD).
The last C4-based S6 Avant rolled off the assembly line in September 1997.
The vehicle's engine was based on the 4.2-liter V8 found in the high-performance Audi RS 2000 and 100 TT models.
It featured a revised exhaust system with a more aggressive sound profile compared to other S6 variants.
The S6 Avant Plus had a rear axle ratio of 3.46:1, which contributed to its impressive acceleration performance.
Only one example of the rare "S6 Plus" variant has been sold at auction for €65,000 (approximately $73,000 USD).
The vehicle's fuel economy was around 10-15 liters per 100 km (22-32 mpg), depending on driving conditions and style.
It had a claimed top speed of 290 km/h (180 mph) when equipped with the Tiptronic transmission and without electronic limiting.
The S6 Avant Plus featured an Audi-specific 4-channel audio system with 20-Watt speakers.
The vehicle's manual transmission came with a driver-selectable "Tiptronic" mode, which allowed for semi-automatic shifting in certain driving situations.