What are the differences between a 1990 20V Ur Quattro and the USA Counter-part (1990 Quattro Coupe/ 20V Sedan)? How far can I take my 20V Sedan to the Ur model? You cannot. The ur-q, including the 20V ur-q are totally different vehicles Vs the 1990 QC/20V sedan. The turbo equivalent of the 1990 QC is the S2 ( not imported to the US). I think the S2 is the goal you should be aiming for..... -glen