my high flow cat had 2 holes for o2 sensors. one had a bolt in it because my type of car doesn't use that hole. but i didnt torque it down enough and it flew off while i was driving today so now theres a huge hole in my cat. does anyone know the measurements of the o2 hole or where i can find another bolt to fit in there and stop the air?

 

hardware store.

buy 10 and see which one fits?

 

yeah that would work. it would help if i could find out the measurement of the o2 sensor hole. i've looked all over the internet but haven't found that out.

 

the other hole is for a wideband to tune the car on the dyno....you can go to a muffler shop and they will have a plug for it.

 

no i think its for some hondas/acuras that use 2 oxygen sensors on the cat

 

Go to any muffler shop. I had the same problem and I went to a muffler shop to buy one and they just gave it to me.

 

so you just said u needed a bolt that fits in your o2 sensor hole?

 

should be an 18x1.5mm.


and yes, any exhaust shop that installs cats usually has a few extras. i know i do...

 

Yup. Matter of fact I think I have an extra one but I see you live in Richmond

 

i looked everywhere today for one for like 3 hours but couldnt find it anywhere. does anyone have one they can mail to me, i'll pay for shipping. and you're sure its 18 x 1.5mm?