For years, the exhaust system (..) remained virtually unchanged until 1975 when a strange new component was added. It's called a catalytic converter(..)CS1 maint: Uses editors parameter (link)
The current model BMW 750iL has a maximum electrical load of 428 amps (5.9 kW)! In this car, over half of the maximum load is from the short-term electrical heating of the catalytic converters