Between 1991 and 1995, Mercedes-Benz sold a sport version of the W124, the Mercedes-Benz 500 E, created in close cooperation with Porsche. Each 500 E was hand-built by Porsche, being transported back and forth between the Mercedes plant and Porsche's Rossle-Bau plant in Zuffenhausen during assembly — taking a full 18 days to complete each model. Design began in 1989 and into 1991. Between 1992 and 1994, Mercedes/Porsche built a total of 10,359 500 E's (1990 — 46 units; 1991 — 2,566 units; 1992 — 4,416 units; 1993 — 1,596 units; 1994 — 1,735 units)[1]. Called '500 E' through model year 1993, for model year 1994 it was face-lifted along with the rest of the range and renamed to 'E 500'.Of these, 1505 of the "super" sports sedans were imported into the USA between 1992–1994, or roughly 500 cars per year of importation.