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 R8
As part of the 2014 Audi R8 launch in the US, Audi Library iPad App was produced, allowing the user to configure a 2014 R8 V10 plus on the fully interactive digital brochure as well as access dynamic Audi content. In conjunction with the new Audi Library app, Audi also released a new video on the S tronic transmission. The video engages and excites sportscar enthusiasts by highlighting the incredibly fast shifting seven-speed S tronic double clutch transmission on the track.