ESR presents our next fun series: the Audi 90 Quattro GTO Cup. The GTO class showcases some of the loudest, widest and most memorable racing machines on the motorsports scene of the 80’s and early 90’s. Brawly, boxy Mustangs, Audi Quattro’s on steroids and high-tech Nissan ZX’s all fought to dominate North American sportscar racing, much like the Group5 monsters in Europe and Asia.These are brutal, vintage cars, but what a glorious sight and sound when a full grid thunders…