The B9 was the first Alpina car based on the E28 platform. The production started in November 1981 and ended in December 1987. In 1985 the B9 received the engine from B6 3.5 and the name was changed to B10 3.5. A total of 577 cars were made. When the B9 was introduced, the flagship of the 5-series range was the 528i. But the B9 engine wasn´t based on the 2.8 litre unit, it was based on BMW´s 3.5 liter six. That engine produced 218 bhp in ordinary form but after Alpina had modified the cylinder head, fitted
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