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 TT
In 2016, the MQB-based Audi TT RS coupé and roadster were announced with the five-cylinder 2.5 litre TFSI engine now producing and 480 Nm (354 ft-lbs) of torque between 1,700 and 5,850 rpm. Audi's all-wheel drive quattro system is the standard layout and the only transmission option is the 7-speed S tronic automatic transmission.