I have a 1997 Civic HX. I found an exhaust I want, but it says it fits SI/EX/LX. But I figured that since mine was a coupe too, it would fit. Any help would be greatly appreciated.

 

you have to put an ex header and a ex cat on too, and then you'd have to do something with the o2 sensor. On our hx's the cat is right on the exhaust manifold and thats why noone makes a cat-back for the hx. Or you could just take it somewhere and get a custom cat-back system made up.