The North American performance specialists from STaSIS present their latest upgrade program for the Audi S5 Cabriolet, called the Challenge Edition, designed to "unleash the car’s competitive instincts".
The key technical features of this conversion are represented by the revised engine electronics and the custom exhaust system featuring four stainless steel end pipes and tuneable high rpm resonators, which enable the car to develop 23 percent more power than the standard version.
The new figures for the 3.0-litre supercharged engine powering the STaSIS Audi S5 Cabriolet Challenge Edition are 410 HP and 370 lb-ft of torque (up from 333 bhp and 344 lb-ft), which in terms of performance are translated into 4.3 seconds when accelerating from 0 to 60 mph (0.7 seconds faster than the stock).
The STaSIS Audi S5 Cabriolet Challenge Edition also benefits from chassis and braking upgrades as the tuner has added a new set of adjustable dampers and Alcon six-piston monobloc calipers with 370mm
front two piece floating discs, high performance pads and braided stainless
steel brake lines.
A ‘road-gripping’ differential was also fitted, plus the car now rides on 20 inch ultra lightweight forged aluminium wheels wrapped in high performance low profile tires. As a result lateral acceleration has dropped from 1.00 G to 0.86 G while brake deceleration dropped from 1.00 G to 0.89 G.

Source: STaSIS