Audi unveiled its latest concept car, the Sportback, at the Detroit Auto show on 11 January 2009. The 3-litre TDI V6 engine makes this the most powerful Audi to date, while the exhaust aftertreatment system makes this the cleanest Audi too, with emissions reduced by up to 90 per cent using SCR technology and a regulated diesel particulate filter cleaning up soot. The Sportback is a preview of the new A7 sedan, due to enter production later this year.