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 the Audi S4, the original Audi S4, built from 1991 until which year?

full_context: Document 1: 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.
Document 2: Volvo S40: The Volvo S40 is a compact luxury car marketed and produced by the Swedish manufacturer Volvo Cars from 1995 to 2012 across two generations.
Document 3: 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.
Document 4: 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.
Document 5: 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.
Document 6: Audi S5: The Audi S5 is the high-performance variant of Audi's A5. It is also the coupé, cabriolet, and five-door fastback versions of the fourth-generation (B8) Audi S4 saloon and estate models.
Document 7: Audi Ur-S4 / Ur-S6: Audi Ur-S4, and Audi Ur-S6 were unofficial names for the original models of the Audi S4 and S6 automobiles.
Document 8: Audi A6: The Audi A6 is an executive car made by the German automaker Audi AG, now in its fourth generation. As the successor to the Audi 100, the A6 is manufactured in Neckarsulm, Germany – and is available in sedan and wagon configurations, the latter marketed by Audi as the "Avant." Audi's internal numbering treats the A6 as a continuation of the Audi 100 lineage, with the initial A6 designated as a member of the C4-series, followed by the C5, C6, and the C7. The related Audi A7 is essentially a coupé-hatchback version of the C7-series A6, but is marketed under its own separate identity and model designation.
Document 9: Audi Performance and Racing: APR LLC is an American automotive engineering and motorsport company that offers aftermarket performance products for cars built by the Volkswagen Group, including Audi, Porsche, SEAT, Škoda and Volkswagen. Audi Performance & Racing was founded in 1997 by Brett Augsburger and Stephen Hooks, automotive engineers looking to offer aftermarket upgrades for Volkswagen Auto Group cars. Their first product was a ECU software upgrade for the 1997 Audi A4 1.8T, but the company soon expanded its product line to include exhaust and turbo systems. APR engine tuning products use proprietary software for reading and writing to Bosch Motronic engine control units.
Document 10: Porsche: Dr. Ing. h.c. F. Porsche AG, usually shortened to Porsche AG (] ), is a German automobile manufacturer specializing in high-performance sports cars, SUVs and sedans. Porsche AG is headquartered in Stuttgart, and is owned by Volkswagen AG, which is itself majority-owned by Porsche Automobil Holding SE. Porsche's current lineup includes the 718 Boxster/Cayman, 911, Panamera, Macan and Cayenne.
Document 11: Audi RS 2 Avant: The Audi RS2 Avant, usually known as Audi 80 RS2, was a limited edition, high-performance Audi five-door, five-seat estate car (station wagon), manufactured from March 1994 to July 1995. Collaboratively designed as a joint venture between Audi AG and Porsche and built on Audi's 80 Avant, designated internally as P1 (instead of B4/8C that it was based on). It was Audi's first "RS" vehicle, and the first of their high-performance Avants (Audi's name for an estate car or station wagon); it used the most powerful and most thoroughly developed version of Audi's inline-five cylinder turbocharged internal combustion engine.
Document 12: 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.
Document 13: 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.
Document 14: Audi allroad quattro: The Audi allroad quattro is an automotive nameplate used by the German automobile manufacturer Audi since 1999. Audi has utilised the name "allroad quattro" to signify semi-offroad ability on two of its mainstream model lines. The main differences between the allroad and the base model are a wider track (made possible by plastic wheel arch extensions), higher ground clearance and adjustable air suspension.
Document 15: 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.
ground_truth: 1994