Audi S6
Audi made a high-performance, 4.2-litre V8 engine (parts code prefix: 077, identification code: AEC) with a Bosch KE-Motronic ECU available as an option in the original European S4s, and made the decision to continue to do so with the S6, making a version of the 4.2 available as an optional upgrade over the 2.2-litre inline five-cylinder turbo. Unlike the five-cylinder turbocharged version, the V8-powered S6 was supplied with a four-speed automatic transmission as standard, but kept the quattro four wheel drive. A six-speed manual gearbox was also available as an option.
Audi A2
The rear spoiler was reshaped, moved and extended through wind tunnel testing, and additional underbody panels were added to minimize drag to achieve a 0.25 cd figure.
The car had an automated manual transmission with a Tiptronic mode on the selector.
The car also had an ECO mode. When engaged it limited the power to (excluding kick down) and programmed the transmission to change up at the most economical point. ECO mode also activated the start/stop function, a feature that was new to European cars at the time.
In ECO mode, the clutch was disengaged when the accelerator pedal was released for maximum economy, so the car freewheels as much as possible, with the clutch re-engaging as soon as the accelerator pedal or brake pedal is touched.
The 3L also has only 4 wheel bolts and finned alloy brake drums at the rear, along with many aluminum suspension components. An internal presentation from Audi appears to indicate that the complete shell of a 3L A2 weighs around less than that of a "normal" A2. The 3L has been noted on the Autobahn under non-scientific conditions to be faster at top speed than the standard A2, mainly as a result of the extremely long 5th gear ratio and the excellent aerodynamics.