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I heard it has to do with cost - the homologation cost of a new 3.0 litre engine and a separate 2.5 litre engine have been reduced by having one engine size, detuned for marketing purposes (the 325 and -in Canada- the 323). In Europe, there is more of a market for the lower displacement engines AND fuel economy of the 2.5 litre (the real one) is much more of a selling factor than here.
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