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 A8
Audi introduced the S8 4.2 quattro into the European market in 1996. The S8 followed the naming convention of other high-performance Audi "S" models such as the Audi A6-derived S6 and was similar in vein of Mercedes-Benz AMG models. In markets such as the UK, the S8 was only available with the automatic transmission. Cosmetically, Audi differentiated the S8 from the A8 with solid aluminium alloy door mirror housings, chrome-effect beltline and lower front grille trim, and polished twin exhaust pipes, along with subtle "S8" badging. 14-way power adjustable and heated sports front seats with memory function were fitted as were heated rear seats. Standard alloy wheels were 18-inch cast aluminium alloy "Avus" six-spoke style. After the 1999 facelift, 20-inch polished nine-spoke RS wheels became an option. In 2002, 18-inch nine-spoke RS wheels became a no-cost option.