The second-generation RS 6, later called the Audi RS 6 5.0 TFSI quattro ("Typ" 4F) was based on the Volkswagen Group C6 automobile platform and was launched in September 2007 at the Frankfurt Motor Show. With factory production starting in December 2007, it was available in Europe from the same date, and began to be exported elsewhere in 2009. The total production run of the C6 RS 6 was 8,000 units, with 6,500 of these being Avants and the remainder saloons. The RS 6 was not available in North America, leaving the Audi S6 as the top performing trim there. (The unpopularity of wagons made it unlikely that the RS 6 Avant would be imported, and although it had been rumoured that the RS 6 sedan would be offered in the United States, nothing came of this as the RS 6 importer could not clear US regulations). Production of the C6 RS 6 ended in the third quarter of 2010.