We’ll start in the obvious place.
A peak power output of 394bhp is a prodigious amount to extract from 2.5 litres of cubic capacity while maintaining reliability.
Porsche’s new turbocharged flat four develops 49bhp less from almost exactly the same displacement. Peak torque has increased for Audi’s straight five, too, albeit by a more modest 22lb ft, with 354lb ft available from 1700rpm.
Almost as important to the TT RS (more so, even, when it comes to redistributing some of the car’s notoriously nose-biased mass) is the shedding of 26kg from the engine’s weight, achieved with the use of a new aluminium crankcase.
The seven-speed S tronic dual-clutch automatic transmission has also been relieved of two kilograms.
And yet, despite Audi’s best efforts at moving and managing its masses, the TT RS still carries more than 60 percent of its weight over its front axle – a front-to-rear weight distribution more akin to that of a hot hatchback than a proper sports car.
The gearbox drives a multi-plate-clutch four-wheel drive system from Haldex, although this latest generation is said to bias the torque split based on which drive mode has been selected.
Like the RS3, the set-up is capable of distributing 100 percent of available power to the back axle if the car deems it necessary, while torque vectoring by braking also allows the car to shuffle drive on a wheel-to-wheel basis.