Audi Ur-S4 / Ur-S6
The Ur-S4 was produced from 1991 to 1994, while the Ur-S6 was produced from 1995 to 1997. They both featured a 2.2 litre, 5-cylinder engine with turbocharging and an intercooler, with of torque. In Europe, V8-powered versions of both S4 and S6 were available. The S4 version sported a engine (the same "ABH" engine as in Audi V8), the S6 had an upgraded engine "AEC" with . American versions featured a 5-speed manual transmission and in Europe a 6-speed, as well as a 4-speed automatic transmission could be substituted.
Audi RS 4
The B8 RS4 is using the Volkswagen MLB platform. It is also only available with the dual clutch S-tronic gearbox configuration, allowing the car to accelerate from in 4.7 seconds. Compared to the related B8 S4, the RS4 features larger bumper air dams and features a double exhaust tailpipes compared to the S4's double twin (quadruple) exhaust tailpipes.