The Firenza isn't the same as a Magnum: The Firenza was homologated as a Group 2 Rally car 2 years before Magnum was homologated. The oldest Group 2 of Vauxhall era is, absolutely, the Viva GT.

Viva GT was homologated in 1969

See here: www.forum-auto.com/sport-auto/histoire-du-sport-auto/sujet378699.htm

-- Last edit: 2013-11-02 22:26:20