The Lancia Delta S4 was a monster for it's time... now I don't remember many data about but I'm sure that was a 4WD, 600HP monster with two supercharger systems (volumex and turbo) with some sort of ground effect body and . the chassis was made with a magnesium alloy that demonstrated all his dangerous side when during the Corse Rally in 1986, Henry Toivonen lost the control of his car and went in a slope. There was a quick and huge fire and Toivonen and his navigator, Cresto, died because of that.
B monsters were put aside at the end of 1986 for the more human A and N groups.
While A group was still a "born to race" class with very good performances you can consider N group similar, in some way, to the SuperBike class.
bye
Battousai