Audi RS2 Avant
The Audi RS2 Avant was a limited edition, high-performance Audi five-door, five-seat station wagon. Collaboratively designed as a joint venture between Audi AG and Porsche, and built on Audi's 80 Avant, it was Audi's first "RS" vehicle, and the first of their high-performance Avants it used the most powerful and most thoroughly developed version of Audi's inline-five cylinder turbocharged internal combustion engine.
The "RS" initials stand for RennSport (from German, literally translated as "racing sport"), and is Audi's highest performance 'top-tier' trim level, positioned distinctly above the "S" ("Sport") specification level of Audi's regular model range. RS cars are usually produced in limited numbers over a limited time scale, and pioneer some of Audi's latest and most advanced technology and engineering prowess; therefore, "RS" cars could be described as halo vehicles. Whilst RS cars generally command a much higher purchase price, compared with their 'lesser' brethren, they also retain very high residual values too.
Source: Wikipedia, 2011