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?

Context paragraphs:
Audi 5 Series DTM: The Audi 5 Series DTM (also known as the Audi A5 DTM (2012) later Audi RS5 DTM (2013-present)) is a DTM touring car constructed by the German car manufacturer Audi AG.  It was developed in 2011 and has been raced in DTM seasons 2012-present.  It was designed by former Audi Head of Research and Development Wolfgang Dürheimer.  The A5 DTM replaced the retired Audi A4 DTM at the end of the 2011 season and based on the production Audi A5.

Audi quattro concept: The Audi quattro concept is a concept car produced by Audi and presented at the Paris Motor Show in 2010.  It commemorates the 30th anniversary of the original Audi Quattro and the Audi quattro four wheel drive system.  Based on the Audi RS5, it features a modified 2.5L five-cylinder TFSI engine and the sixth generation of quattro transmission.  It had been reported that Audi are considering a limited production model (200–500 cars) based on the quattro concept, but the project was shelved in 2012.

Audi S6: The Audi S6 is the high performance variant of the Audi A6, an executive car produced by German automaker Audi.  It went on sale in 1994, shortly after the "A6" designation was introduced, replacing the "100" nameplate.

Audi A5: The Audi A5 is a series of compact executive cars produced by the German automobile manufacturer Audi since March 2007.  The A5 range comprises the coupé, cabriolet, and "Sportback" (a five door hatchback coupé featuring a fastback like roofline with a steeply raked rear window with integrated trunk lid) version of the Audi A4 saloon and estate models.

Audi Q5: The Audi Q5 is series of compact luxury crossover SUVs produced by the German luxury car manufacturer Audi from 2008, The original first-generation ("Typ 8R") model was the third member of the "B8" family to be released after the Audi A5 and fourth-generation A4, all being based on the Audi MLB platform.  The second generation Q5 ("Typ 80A") debuted in 2016 and shares the Audi MLBevo platform with the corresponding "B9" versions of the A4 and A5.

Audi RS 4: The Audi RS4 quattro is the top tier and highest performing version of some specific generations of the Audi A4 range of automobiles.  It is a sports-focused compact executive car (often called sport compact in some countries ), produced by Audi's high-performance private subsidiary quattro GmbH, in limited numbers, for German car manufacturer AUDI AG, part of the larger Volkswagen Group.  It slots distinctly above the Audi S4, as the fastest, most sports-focused model based on the A4's "B" automobile platform.  The RS 4 made a comeback in 2012, in Avant form only based on the Audi A4 Avant.

Audi S4: The Audi S4 is the high performance variant of Audi's compact executive car A4.  The original Audi S4, built from 1991 until 1994, was a performance-oriented version of Audi's 100 saloon/sedan.  All subsequent S4s since 1997 have been based on the Audi A4; and as the A4 has evolved from one generation to the next, so has the S4.

Audi A4 DTM: The Audi A4 DTM is a 4-door touring car (DTM) constructed by the German car manufacturer Audi.  It was first developed for use in the 2004 DTM season, replacing the Audi TT DTM at the end of the 2003 DTM season.  Based on the Audi A4, it was continually improved over the course of six facelifts between 2004 and 2011.  The Audi A4 DTM was succeeded by the Audi A5 DTM in 2012.

Audi A4: The Audi A4 is a line of compact executive cars produced since late 1994 by the German car manufacturer Audi, a subsidiary of the Volkswagen Group.

Volkswagen Passat (B5): The "B5" version of the Volkswagen Passat, based on the Volkswagen Group B5 platform, was launched in 1996 in Europe, 1997 in North America, and March 1998 in Australia.  Its PL45 platform was shared with the first-generation "Typ 8D" Audi A4, which was unveiled 2 years earlier, and saw a return to the Passat sharing its platform with Audi's equivalent model for the first time since the second-generation (B2) Passat, which shared its platform with the second-generation "Typ 81" Audi 80/Audi 90 (the A4 is the successor to the Audi 80 line).

Supporting paragraphs: Audi RS 4 Audi S4
Answer: Audi S4