The Audi racing program went through some really interesting changes between the late 1980s and the mid 1990s launch of what became one of the more dominant touring cars produced, the A4 STW. Continuously evolving regulations were part of that, coupled with a global recession and cost-cutting measures among many manufacturers. So it was just a few short years between the flame-breathing iconic 1989 Audi 90 IMSA and the death of the turbocharged Audi racing sedans entirely, though there were some interesting steps in between. For example, Audi tried their hand in the France with the 1992 Audi 80 quattro Supertourisme I looked at a few years ago:
That car was powered by a crazy turbocharged 2.0-liter inline-four. Simultaneously, Audi built a 2.5 liter V6 80 for the German DTM series, though they ended up withdrawing in protest over the series rules, and the car never ran. Quietly, in the background, a more reasonable – and very entertaining – solution emerged. In 1990, the British Touring Car Championship revised their rules to make racing more affordable in the wake of the massively fast and expensive Ford Sierra RS500s. The new regulations were based around production sedans of no more than 2.0 liters and with no turbochargers. This, in turn, led to a series of homologation specials to make cars legal for the new Super Touring regulations, and Audi was happy to take part. What emerged was the Audi 80 Competition quattro – limited to 2,500 units to comply with regulations, Audi stuffed a development of 2.0 16v inline four also found in the European-market B3 Coupe into the B4 chassis quattro, stuck an S2 front end on it and a raised rear spoiler, quattro-script interior and a few other goodies, and sold them to the public: