The Quattro Spyder (QS) debuted at the 1991 Frankfurt Motor Show, some 15 years before the R8 would enter production. Like the R8, the QS was mid-engined, all-wheel drive, and aluminum-bodied.
Power came from a 2.8-liter V6 with 172bhp. Audi claimed it weighed 1,100kg, so it ought to have been reasonably sprightly, if not massively fast.
Why didn’t Audi build it? Because the “envisioned price of 100,000 German marks could not be met”, even though widespread speculation that it would be built (it does look production-ready, doesn’t it?) resulted in Audi dealers taking thousands of advance orders. But it was not to be. Just a month after showing the QS, Audi went full concept and gave us the Avus, with its mid-ship (wooden) W12 and bright-finish body, and the QS was consigned to the history books for good.
Source: https://www.topgear.com/