Latching that “S” onto the end of an Audi model name usually means good things. In this case, the 2009 Audi TTS takes the TT coupe and roadster and adds more performance, including a more powerful four-cylinder turbocharged engine. Cars.com reviewer Mike Hanley looks at the TTS to see how it fares against small sports cars from Porsche and BMW. Does he find Audi’s Achilles heel? Read the full review to find out.