A snaking, high-desert road course is the ideal test of the all-new 2018 Audi S4 and S5—cars that are spawned from the petri-dish of their ultra-high performance stablemates, the Audi R8 and RS. (To clarify: the German automaker’s nomenclature for sedans, coupes and roadsters begins with its volume-leading base “A” models, and then imbues them with sports-minded looks and more driving character and labels them …
Test Drive: 2018 Audi S4 + S5