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i have a 1997 civic hx and cant pass the smog i been looking for a catalytic converter so it can pass the smog becuase the one i have the guy that did the smog said it was clogged and the test it didnt pass was the air injection and my question was could i fix the converter that i have right now or would i have to buy a new one?

the other question i had was would a 1998 ex converter work for my car?

 
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Yes all D-series engines (apart form D15 that has converter mouted on the exhaust manifold) have very similar converters so it should work. Just watch out to get one that's in better shape than yours. Oh and don't go to testing with an "cold car". Try driving for some 10 miles or so before doing the test. On motorway if possible. The hotter the converter the better it'll work.

 
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Wrong. Some D16s have cats in the header some don't. The 98 EX that the OP mentioned has the D16Y8 motor that does NOT have the cat in the header. That cat is located underneath the chassis after the downpipe. It's possible to use it on the HX but you'd have to get a different d-series header without the cat in it and extend the wires for the secondary O2 sensor since that sensor will now be located further downstream in the exhaust.

It's best to look for a header for your engine or possibly one from a D16Y7 (96-00 DX).

 
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Sorry my bad. Tought only D15's have cat in the header.

 
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HX uses special cats, two i think. one for normal operation and another for reducing Nox emissions. depends which one it is i guess.