Yeah, don't lose sight of the idea that BMW rates their engine versions in kW, and sometimes it's fuzzy what conversion factor is used by the US marketing group to determine what they want that to equate to in horsepower. Wiki lists a 195kW version of the N52 in the Z4 and a 200kW version in the SUVs. N53 also is listed as being rated for 200kW in the 30i designation models where it was installed. Since we never had N53 in the US, there wouldn't have been much reason for anyone to assign a horsepower value to it.
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