The miata is FAR from an econobox - it IS a sportscare in all of the ways that matter. I'd agree that from the list given, the miata has the most "econobox" of motors, but in the sub 2L arena, most engines ARE econobox motors. one of the biggest issues IMHO with the fundemental principles of the class' displacement/weight formula. I like production's answer to that equation better. it allows for flaws to be equalized even under a limitted prep philosohpy.