Do you guys think its necessary to install a new cat converter? I only have 74k on my Accord but will be getting OBX headers and WS2 exhaust. Heres one that i've found, though I noticed it said there wasn't an O2 hole, so i'm kind of assuming there is a sensor in there. Cat converter

 

You don't HAVE to install a new cat if you don't want.... If there is no hole in the exhaust for the O2 sensor you might have to drill/tap it to put it in...

 

Well, when I was looking at headers, I noticed that on the piece that actually connects from the bottom of the header to the cat, there was a hole for an O2 sensor. So maybe theres another one right after