Why was the E12 M535i never officially sold in North America?

The E12 M535i was never officially sold in North America because the 3.5-liter M30 engine was not yet available with a catalyst and therefore could not meet U.S. emission control standards. Also, the addition of such equipment, as well as the various government-mandated safety items, would have reduced performance to essentially that of a North American-spec 528i. More.

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