Power sharing : The standard model will use the 420bhp 4.2L V8 engine, but Audi may include the 5.2-litre V10 from the S6 and S8 sports-saloons into a mid-level model. An all-singing, all-dancing 5.0-litre twin-turbo V10 from the RS6 could be the choice for a high-performance RS-variant.
