DX. There is a 22 stock hp difference in the STD and the LX/DX.
Sometimes the addition of "clarifying" words do just the opposite."Honda Civic standard (HB & Sedan) (88-91)"
If "standard" is a term of art in Hondaland then it means what it means. I.e. if there is a model that is officially or generally known as the "standard" model then that's the one, and that's the only one, it means. However, as Kevin points out, if that "standard" model only came in HB, the inclusion of "& Sedan" does make you wonder.Sometimes the addition of "clarifying" words do just the opposite.
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