Hey guys, is there a difference between any of the 94-01 GSR and LS cats?

Tried to do some searches but didn't get very far. Would appreciate any input.

Reason why I'm asking is because I'm trying to smog my 96 jdm gsr civic hatch and wondering if using one or the other mattered. It looks like my o2 bung is on the A-pipe. I'm not sure which one to get?

Thanks guys.

 

Isn't it illegal to have JDM engines in there anyway in CA?
If your car is obdII you'd need the 96 and later cat.

 

Nope not illegal. My vehicle has been BAR'd.
I have a 93 civic si with a b18c drop so I have obd1 wiring all around.

I was doing some searching and it looks like all 94-99 GSR cats are the same with an o2 bung?
Can anyone confirm?

 

94-99 GSRs are all the same. I assume that the o2 bung was only NOT in the 94-95 model though.

 

there are no o2 bungs on obd1 cats only on obd2 cats. 94-95 obd1 96-01 obd2

 

I've been doing some more research and it looks like the 94/95 GSRs have 1 o2 bung on the cat and the 96-01 GSRs have 2 o2 bungs on the cat.

94/95 LS seems to have 0 o2 bungs on the cat but 1 on the headers
96-01 LS seems to have 2 o2 bungs on the cat AND 1 on the headers, according to this diagram I'm looking at. Doesn't make sense tho.