notable change being a slightly less powerful (-7 HP) engine in the 1993 and 1994 model for USA. The 1994 E 500 model is more easily identified because of the cosmetic changes that affected all E-Class cars that year (updated headlights, grille, and trunk-lid; the bumper scuff bars were painted the same color as the car). The engine, however, remained unchanged from the 1993 500 E. 1994 models carried an upgraded sound system made by Becker or Alpine, replacing the two-piece Becker 1432 unit used in model year 1992 and 1993 cars. Significantly, 1994 models had larger front and rear brakes than 1992 and 1993 models, courtesy of the R129 SL600 roadster. Numerous running changes were made to the car's mechanical systems during its production life. All 500 E and E 500 models imported to the United States and Canada were compliant with the more stringent California emissions (a so-called "50-state car", legal for sale in all 50 states).The 500E and E500 were known by Porsche as Type 2758 in that company's official nomenclature. As of June 2011, an example of a 1995 E500 Limited is on display in the new Porsche Museum in Zuffenhausen, Germany. Aftermarket modifications Common performance improvements include wheel and tire replacement, aftermarket exhaust kits, and replacement or reprogramming of the Electronic Control Unit, which removes the 250 km/h (~155 mph) speed governor. To boost acceleration times, some owners disable the car's slip reduction feature and program the automatic transmission to start in first gear instead of the normal second gear. Numerous other modifications exist for the car, including increased displacement up to and including 6.5 liters, nitrous-oxide systems and a few custom supercharger systems to boost output to well over 400 HP. E 500 Limited During the 1994 model year, Mercedes-Benz introduced the E 500 Limited variant. Originally intended as a limited edition trim package, with 500 copies to be produced, Mercedes-Benz ended up producing 951 of these models during 1994 and into 1995. The E 500 Limited was designated by code "958" on the data card. It consisted of trim upgrades, including a mottled, colored leather pattern on the center inserts of the front and rear seats, steering wheel, and gear shift lever; exclusive "bird's-eye maple" interior wood on the dashboard, doors, and front and rear center consoles; 17" EVO-II alloy wheels; a slight drop in ride height over regular E 500 models, specially