We believe quattro GmbH is secretly working on a 600 horsepower version of the 4-liter turbo engine to go into the RS6 and RS7 Plus models in early 2015. That's 150 hp from per liter of displacement, coupled with cylinder deactivation and a the sound of machineguns firing. That would be perfect for the first-ever RS8.
Sadly, our dreams of a super-powered A8 are shattered by the reality of the Audi product cycles. The A8 is an old car, having received a mid-life facelift over a year ago. Development has already started on the next generation and company bosses are unlikely to divert funds from that just so we can see RS8 versus S 63 AMG comparison videos.
If we're going to have to wait another three or four years for the RS8, we might as well know what could have been/should have been. This next rendering was created by RM.Design and is based, predictably, on the current S8. A virtual Audi flagship has been stitched together using larger intakes and wheels from other RS models.
To be honest, imagining what an RS8 would look like is easy. Imagining how mind-bendingly fast it would be… that's an entirely different question.