Definition for econobox:
Web definitions:
An econobox is a US slang term for any of a series of small, boxy, fuel-efficient car with few luxuries and a low sticker price..
en.wikipedia.org/wiki/Econobox
frs/brz doesn't fit the 'boxy' term
if this body style is 'boxy', then all porsche vehicles should be considered box cars.
With that said, I'll just leave this here.