Audi's quattro GmbH division, responsible for the RS models and the new R8, is working on a turbo TT RS, a V-8 RS5, and a V-10 RS6. We're not going to see RS versions of every Audi, though. In that sense, RS is to Audi more like M is to BMW than AMG is to Benz. AMG builds super-hot editions of everything in its lineup; M and RS are more selective.
The Additions To The RS Arsenal
TT RS. A high-pressure turbocharged four-cylinder engine with about 300 horsepower will define the hottest TT. Naturally it'll have quattro drive, and the weight will reportedly be comfortably below 3000 pounds. On sale in about two years.
RS6. The current 435-horsepower V-10 will be more aggressively tuned to tip past 500 horsepower, with braking and tires to match. The torque bias will be to the rear, and wider fender flares and deep front and rear fascias will tip off onlookers. Launches after the TT RS.
RS5. The A5 two-door coupe was set for a Geneva debut. The A5 is a two-door version of the A4, and, within a couple years, quattro will wedge the R8's mighty V-8 into it, offering 420 horsepower and the RS4's suspension mods.