Question: The Audi RS4 quattro is the top tier and highest performing version of some specific generations of the Audi A4 range of automobiles, it slots distinctly above which high performance variant of Audi's compact executive car A4, and was the original Audi S4, built from 1991 until 1994?
Sentence (from "Audi RS 4"): It slots distinctly above the Audi S4, as the fastest, most sports-focused model based on the A4's "B" automobile platform.
Relevant evidence: Yes