Where exactly does the cat go? Upstream or downstream of the o2 sensor?

My exhaust was so rusted up that the mount for the 02 was about to come loose, so I had an exhaust shop in east TN (where there are no emissions) weld me up a new bung.

I took it to a shop here locally where emissions are required, and the shop wouldnt touch it cuz it didnt have a cat. <img src="/forums/images/graemlins/rolleyes.gif" alt="" /> He wanted like $300 to put one on there.

I would like to get it legal one of these days.

Its registered in east TN now so I dont have to worry about it... for now. <img src="/forums/images/graemlins/smile.gif" alt="" />