According to Wikipedia, “Avant-garde represents a pushing of the boundaries of what is accepted as the norm or the status quo, primarily in the cultural realm.” In 1863 in Paris it meant artistic revolution. If BMW, Audi, Infiniti and Lexus represent the homogenous and conservative “Salon de Paris” of the automotive world, then Cadillac is a “Salon des Refusés” of one with the bold 2008 CTS 4.