Audi Sport Quattro S1 PDK.
This is Quattro S1 number RE15, one of two cars made with the PDK gearbox. The other, RE02, was raced by Walter Röhrl in the 1985 Lombard RAC rally but retired early after going off the road and rolling down a hillside in the dark of a night stage. The demise of Group B in 1986 meant RE15 would never race and was acquired by Röhrl and later sold.
Porsche had developed the Porsche Doppelkupplung, or PDK, dual-clutch gearbox for the 962 race car and through Dr Ferdinand Piech the technology found its way into the Audi Sport program. With upwards of 530bhp even Walter Röhrl admitted to being scared of the mighty S1 at times.
Porsche Museum, Stuttgart, Germany.