I have a 95 gsr obd1 soon to put on jdm 4-1 header with a 2.5 high flow cat. I bought a cat with two o2 bungs ( one is before the cat comb and the other is after the cat comb) I know all i need is two o2 bung. One is on the header and i just need one on the cat.
My question is that which o2 bung can i use or soppose to use and how do i plug up the other one. thanks

 

i believe it's the o2 bung after the honey comb of the cat (towards the end) is what you use.

 

anyone else with any input. thanks for the help vtecfool

 

Well on a stock 94-95 gsr the o2 goes in the cat before the comb.

 

anyone else?

 

Theres also a bung right before the collector on the jdm 4-1. I ordered the cat w/o any bungs because all you need is the one in the collector.

 

mine is on before the comb....and you can probably just use a short bolt to plug that up...thats what i did.

 

so obd1 and obd2 dont matter where the o2 bungs are located? mines obd1

 

Stick it at the collector or before the cat. But not after.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by grn4drgsr &raquo;</TD></TR><TR><TD CLASS="quote">so obd1 and obd2 dont matter where the o2 bungs are located? mines obd1</TD></TR></TABLE>

last i recall obd1 only has an o2 bung in the header, not the cat. or i could be wrong

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by xteg01 &raquo;</TD></TR><TR><TD CLASS="quote">

last i recall obd1 only has an o2 bung in the header, not the cat. or i could be wrong </TD></TR></TABLE>

yeap, you are wrong. just replaced my cat on my odb1 gsr this weekend. it is before the "honey comb" on the cat.

and if you are searching for a plug, check out the local autoparts store. I bought mine for about $3 at kragens. it's in the oil draing plug section bolt pattern m18x1.5

 

thanks a bunch

 

another question is that my cat is 2.5 and my exhaust piping is 2.36 (60mm). What size would i need to connect it up to the 2.36? just another 2.5 end flang or something that fits 2.36? thanks

 

Take it to your muffler man. And have him hook you up. I had a 5 zigen exhuast on my car before. 2 1/2 inch. I bought a 2 1/2" cat. I took my stock cat and the catco down to the shop and had him match the flanges. Of course I didn't realize that my 5 zigen had a reducer on it so it bolts up correctly to the OE cat. It leaked like a son of a gun until I got a new flange welded on my exhuast, and got rid of the stupid reducer. Make sure your exhaust doesn't have one or you'll have leaks too. Thats pretty much guaranteed. Good luck.