 Complete the following phrase:  however, a transaxle housed in an aluminium alloy case for racing purpose in midship-engine configuration had been designed by Ferdid Porsche and built by Horch in 1933 as a part of Auto Union Type A.brValerio Colotti had been producing gearboxes for racing purposes before 1959, and his transaxle for midship-engine racing cars debuted on 10 May 1959 at 