The answer, Audi, reckons, is a thumping 360bhp - more than a Lotus Evora or a Porsche 911 Carrera - which British buyers will be able to check out for themselves when the latest model, the TT RS Plus arrives later this summer.
A spokesman for the German company said: "The resulting 360bhp and 465 newton metres of torque can be channelled to the quattro all-wheel-drive system through either a six-speed manual gearbox or the seven-speed S tronic twin-clutch transmission.
"With the latter installed, the TT RS Plus Coupe catapults from rest to 62mph in just 4.1 seconds to the tune of an addictively full-bodied five-cylinder growl, closely followed by the Roadster, which needs 4.2 seconds. The top speed is limited to 174mph."
However, it's also the most expensive TT to date, and you'll need a cool £48,945 to get your hands - that's nearly £4,000 more than the standard, less powerful TT RS. The RS Plus version is available to order from Audi's showrooms now.