I have never found much similarity in BMW and Audi’s overall designs, however I had never really looked at photos of the superb 100 Coupe S side by side with the ‘rare’ Frua design study 2002 GT4 side by side. It’s amazing to know that both of these designs first debut’d in 1969 at around the same time; however whereas BMW rejected many of Frua’s designs for their cars (however ultimately using the ideas in the Frua penned E12 5-series), Audi ended up producing a limited edition run of 100 Coupes. They may not be identical designs, however i think this may be the closest Audi and BMW ever got, and probably will ever get in terms of design studies. Personally I think they are both fantastic with their heavy Italian influences; and while the 2002 GT4 went into prototype obscurity—the 100 Coupe S maintains its popularity amongst dedicated enthusiasts.
IEDEI 
What would we call this body style? It was sort of the prevalent Italian GT look right before the wedge came in. There are many cas with this styling treatment, like the Aston DBS, and some of the Maseratis and Lamborghinis of the late 60s and early 70s.
i definitely see a lot of italian influences….BUT then when i put an Aston Martin DBS in the picture….and toggle between the AM and these other 2—–the similarities are shocking!!! compare this with the pics of the 2 others….
