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Some of these same dynos that are supposedly the fault for the surprisingly low readings seen from the M3 are probably ones that would also give surprisingly high readings for the 335i. The M3 seems to typically make slightly less than BMW specifies when using the common drivetrain loss factor of 15%, while the 335i seems to make slightly more than BMW specifies when using the same 15% factor. One car may be overrated by BMW and one car may be underrated.
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