Audi TT a 'show car', Audi has not ruled out the possibility of small-scale production. With its world debut at the 2009 Geneva Auto Show, and developed by Audi's high-performance subsidiary quattro GmbH at Neckarsulm, Germany, Audi released the first ever compact sports car Audi "RS" variant – the , which was available from 2009 in Coupé and Roadster variants. The TT RS featured an all-new 2.5-litre Inline-5 turbocharged petrol engine. This new engine produces a DIN-rated power output of from 5,400 to 6,700 rpm, and torque of at 1,600–5,300 rpm. Ever since the original Audi "RS" model – the Audi RS2
Audi S6 is fitted as standard with Audi's trademark quattro four-wheel drive (4WD) system, the S6 using the Torsen-based permanent 4WD. Audi was restructuring their model lineup in early and mid-1990s, and in late 1994, began selling the fifth generation (C4) Audi 100 model, re-badged as the Audi A6. Wanting to keep a sports-saloon in their lineup, the company made small revisions to what was previously known as the Audi S4, renaming it the Audi S6; the S4 name would eventually be re-used for a completely different model derived from Audi's smaller Volkswagen Group B platform-based Audi A4. As this was the