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 S4
As standard, the B9 S4 features 18-inch 5 double-spoke wheels with summer tires. New owners could also choose optional 19-inch 5 V-spoke wheels.