AUDI has extended its second-generation TT range with the arrival of the front-wheel-drive 1.8 TFSI petrol opener, all-wheel-drive TDI quattro and the version that may prove to be the most popular – the 2.0 TFSI quattro S-tronic. But does adding a Haldex AWD system to the glorious turbo four-pot petrol engine and DSG twin-clutch gearbox improve the breed? And how has the TT aged in the three years since its launch in Australia? Read on to find out …