Audi S4
Audi's quattro four-wheel-drive system was standard on the C4 S4/S6; a first-generation Torsen-based system which used the "T-1" automatically biasing centre differential (ATB) was used on vehicles equipped with manual transmissions, while a transfer box based system was used on vehicles equipped with an automatic transmission.
Audi V8
Standard features for the Audi V8 included a 32-valve, double overhead camshaft (DOHC) V8 engine and a four-speed electronically controlled ZF 4HP24A automatic transmission providing Audi's quattro permanent four-wheel drive system. A five-speed (later in production six-speed) manual transmission was also available.