TJVTek88

I bought some headers and now I am looking at a High Flow Cat for my 95 Civic EX. What I don't understand is if I need an O2 sensor in my cat or not. I wouldn't think I need one if one is in my headers but there is one in the hi flow cat i wanna buy.

Do I need the port and O2 sensor in it or get a cat with no o2 sensor port in it?

any help would be appreciated thanks

Hatch Man(GsR)

why would you want an o2 sensor in your cat on a honda civic? Use the stock one that threads into your headers, the headers for your car should have a threaded opening for your stock o2...

Get a cat with NO o2 port in it, I dont even know how you would wire for 2 o2's with a p28 ecu...

Str8EJ

above post is correct.
your civic is obd1.
obd1 civics use a single o2 sensor.