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 S5
Fitted with a completely new and more powerful 3-litre V6 petrol engine, the S5 has direct injection as well as a twin-scroll turbocharger to reduce both weight, and cost. The turbocharger is mounted within the engine V and as a result has reduced turbo lag response times. The quattro all-wheel drive system receives power through a locking centre differential that splits torque sent to the wheels at 40% to the front and 60% to the rear. The system can also divert up to 70% to the front or up to 85% to the rear. time is around 4.4 seconds (coupé) & 4.5 seconds (sportback), with a limited top speed of .