i need to know the thread size of the o2 sensor after the cat. im pluggin it up and need to find the thread size or if anyone knows what size spark plug will fit. i've seen that done as well thanks.

I will be able to tell you in about 2 days when I go to get something to fit mine.

ok but since no one knew and muffler shops will be open on monday, i'm jus gonna get it welded up. so i won't have to worry bout it.

You still putting a bolt in there?

And what exactly are you doing with the sensor?

leave the sensor there

I don't need the sensor... or have one to fill the hole.

same here, mine popped out and got drug down the road for like 5 miles by the time i could pull over to fix it. it was beat up to much to keep. so i gotta get a knew one.

Popped out? I've never heard of such a thing.

me neither. possibility that it could've come unscrewed. but i was racing a hond hatch. and my car made a loud bang, and felt like fuel cut. but then i hear clank clank clank clank, from under the car. and then you know of course being a DSM owner a million things are going through my head of what it could be. So i pull over bout 5 mi down the road and get out look under my car, and my 02 sensor was jus hanging there bouncing around. so i cut it of and kept goin.