The Group B period of FIA Rally from 1982 through 1986 produced some truly surreal vehicles. Since manufacturers had to comply with homologation rules requiring 200 road legal versions of the cars be built, the public benefited by receiving some very eclectic street legal cars during the mid-80s.
To comply with those requirements, some companies like Audi utilized cars like the Quattro that were higher production, relatively speaking. But other manufacturers created very small batches to meet the minimum requirements, like Lancia with the 037 as was covered here. Ford's approach was akin to the latter with the RS200.