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Typically BMW has been conservative in it’s power ratings. It used to be that a variation of 10% in engine output was normal from engine to engine due to manufacturing tolerances, this may be tighter now, but it has been postulated in the past that the BMW quoted figures will always ensure any car produced will meet the quoted spec and on average will exceed the spec.
In the past, it has typically been non-European manufacturers who have been taken to task for quoting power outputs that some of their vehicles have not been able to meet.
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