CanAm-Canadian American racing series. Apparently lots of Porsches test drivers were killed testing the cars. Late 70's series disbanded due to too many accidents/deaths. Pretty much a no limits catagory.
Group B Rally-Audi developed Quattro for series, ditto Lancia-Intergralle, Ford-RS200, Porsche-959 I think, they all had a go-ferrari too?
Have a look at
www.stormloader.com/groupb/
Cheers