I was a young mechanic at a Honda dealer when the HX was out. Two door only, lean burn E-Vtec engine meant for fuel efficiency, alloy wheels, same seats as the EX... The engine in the HX trim was made in Japan while other Civics had Ohio made engines.
Most came with a 5 speed manual but a few had a CVT which was unreliable as one would expect in the early days of the CVT. The HX Civic felt faster than the EX of the same model year despite the HX not having quite as much HP.