mcgee*

I got headers without o2 sensor,

should i buy a cat converter that Utilizes factory O2 sensor position

or do i still need one to be welded in?

saveacivic

either way but less chance of it throwing a code if you do it on the header. cheaper than a cat too...

Hatchback of Notre Dame

who uses cat's anymore??

IHateJDM

however you set up your exhaust, you need your o2 in there somewhere. A good exhaust shop can weld in an o2 bung very cheap. IMO, unless you are turbo, get a high flow cat, you won't gain anything noticable with a test pipe while NA.

mcgee*

ok i called in they charge around 20-30 dollars, when i ebay cat cost around 27 dollars... which is a better buy?

IHateJDM

a $27 ebay cat is not a real cat. its a resonator. Look for brand names on ebay for cats. I got a magnaflow hi-flow off ebay a while back for about $50 shipped.

mcgee*

alright so a cat would be better

also would the o2 sensor fit all the way down their

IHateJDM

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDM_EG* &raquo;</TD></TR><TR><TD CLASS="quote">also would the o2 sensor fit all the way down their</TD></TR></TABLE>

not all cats come with the o2 bung in it, you may still have to add it. That all depends on the cat, so you may still be better off just going to an exhaust shop. $20-$30 is about right at the exhaust shop. You can't really get anything done cheaper than that.

dohcVTECeg2

extend the wires. then it will reach. i did this on my headers. no prob what so ever. havent thrown a code.

mcgee*

alright thanks ill do the shop, thanks

Turbo_y8

headers!!!!!!

Relic1

The best place for the primary O2 is within a few inches of the final merge in the header.
you can technically put it in the cat if there is a bung for it before the cat material.
if the bung is after the cat material you will run super rich at all times and may throw a CEL.

groundedaccord

Just do what he said and go to an exhaust shop. You shouldn't have any problems after that.. make sure when you extend your wires that you do a nice job to prevent a CEL from popping up someday.