Audi A6
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 Le Mans quattro
The Le Mans quattro's engine was a development of the Gallardo's, with the same displacement but utilizing different cylinder heads as well as twin-turbochargers and Fuel Stratified Injection (FSI) technology, resulting in the high output of , and of torque. The gearbox is the six-speed sequential manual transmission used in the Lamborghini Gallardo.