AC Schnitzer’s second Geneva-bound model is the ACS5 Sport S, a model based on the BMW 550i. Looking at their creation, no one would be all that impressed; there aren’t many changes done to the exterior leading people to believe it was just another minor and unimpressive upgrade for yet another BMW model. Then there are those other people that would expect a fantastically upgraded engine to counteract the anticlimactic exterior. The second group of people would be correct in their assumptions.

The ACS5 Sport S takes the standard 4.4L V8 engine found in the BMW 550i and has toyed with it enough to bump the standard 400hp to a phenomenal 540 hp and 750 Nm of torque. With the extra 140 HP, the ACS5 Sport S will sprint from 0 to 60 mph in 4.5 seconds with a top speed of 200mph. Flying through the corner will also be made easy with an added limited slip differential[...]

Source: topspeed Tuning