AC Schnitzer premieres the ACS5 Sport S and ACS 99d

  German tuner dials up power on the BMW 550i and converts the Z4 to an 320d Efficient Dynamics-influenced diesel-sipperGerman tuner AC Schnitzer has previewed two new models ahead of their Geneva debut.The ACS5 Sport S and ACS 99d are based on the BMW 5-Series and Z4 models, respectively. The aim of the Aachen-based tuner with these two models is to create power and performance while still