on the 5-speed manual models. Special models 725i The 725i model was not officially sold, it was produced for West German government agencies, which at the time, were not allowed to have engines larger than 2.5 liter on official cars. 921 models were produced. Turbocharged 745i The 745i was a high-performance model sold in left-hand-drive European markets from 1979–1986. It was initially powered by the M102 engine, which is a turbocharged 3.2 L version of the M30 straight-six engine, producing at 9 PSI of boost. In 1982, the engine was upgraded to the M106, which increased the capacity to 3.4 litres and the fuel injection system changed from Jetronic to Motronic. Boost pressure was reduced to 6 PSI, however power output was unchanged. All M102 cars were built with a 3-speed ZF 3HP22 automatic transmission. All M106 cars were built with a 4-speed ZF 4HP22 automatic transmission. Options included heated front and rear power reclining seats, gasoline fired heater, leather covered cellular telephone, rear-armrest radio control, water buffalo hide upholstery, and burl wood trim. The name 745i comes from the theoretical assumption that turbocharged engines have approximately 1.4 times more power than naturally aspirated engines. By this assumption, a 3.2 litre (3205 cc) turbocharged engine would have similar power to a 4.5 litre (4487 cc) naturally aspirated engine. South African 745i The South African 745i model was powered by the naturally aspirated M88/3 engine, instead of the turbocharged M102/M106 engines of the European 745i. A right-hand-drive version of the turbocharged model was not possible due to the turbocharger being located in the right-hand side of the engine bay. Instead, the 745i was fitted with the M88/3 engine, as used in the E24 M635i and E28 M5. The engine uses a 24-valve DOHC valvetrain and the fuel injection system is Bosch ML-Jetronic. A production run of 209 South African 745i was built from 1983 to 1987, 192 of which were with an automatic gearbox and 17 with a 5-speed manual gearbox. BMW South Africa entered one of these 745i models in Class A of the South African Modified Saloon Car Championship The 745i won the championship in 1985, the only BMW-Sanctioned motorsport application in the history of BMW 7 Series cars. United States and Japanese market models Only the 733i, 735i, and L7 models were sold in the United States and Japan. These markets also received only upscale versions, usually including