The unique S5 was called the ‘Evo’ and it featured a 420hp (313kW) version of the standard model’s 4.2L V8 engine as well as Audi’s new seven-speed S tronic dual-clutch transmission.
Apart from the more powerful engine and dual-clutch gearbox, the S5 Evo was equipped with the same specifications as the standard S5. This meant that it used the same quattro permanent four-wheel drive system with variable torque distribution from its basic setting of 40% to the front and 60% to the rear axle. The Evo also featured a button for ‘comfort’ and ‘sports’ mode, the latter providing quicker gearshifts, better throttle response and a firmer ride.
Source: Motor Authority