BMW hasn't sold a four-door M3 in the US since the E36 version in the second half of the 1990s. Back then, purists whined that they'd sold out on the original M3 racing concept, not only by adding two extra doors, but two extra cylinders-going from the E30's legendary 2.3-liter four-cylinder to a new 3.0-liter inline-six.
As you know by now, the all-new 2008 M3 has apparently "sold out" once again, annoying purists with not only a return to the sedan (and convertible) but by adding another two cylinders. To the cognoscenti, though, the M3 remains the leader of the pack, the example by which all other sport sedans are judged even if it throbs with a 4.0-liter V-8 heart.
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