Claimed performance is impressive, with Audi saying the run to 62 mph takes just 4.6 seconds, 0.7 second quicker than it cites for the regular-grade TT.Top speed is governed at 155 mph, and the only available transmission is a six-speed dual-clutch automatic.The TTS also is all Quattro, all the time. All-wheel drive in an Audi is fine with us,but it is a shame that the company won’t offer the slick six-speed manual in the U.S.