Engine trying to install new o2 sensor... problem

Are the threaded parts welded onto the exhaust pipe or how do they attach? If so you probably have to get a new pipe but on the 93-97 after market header I know they're just studs so they should be replaceable.

vortex, he's talking about the one on the manifold, it has two studs mounted to the merge collector i think. it's the one everyone strips (inc. myself). You're pretty much fucked. You need a new manifold.

trying to install new o2 sensor... problem

Im trying to install a new oxygen sensor on my 98 corolla... the one before the cat on the front header pipe. I kinda stripped the bolts when i took the nuts off and the dealership said that I need to get a new front header pipe installed on to get the nuts tight enough around the new oxygen sensor. Do I really need to order a new header pipe or can I get by with just fixing the threads?

try to use the tap-&-dye set- If you severly stripped it you can just re-dye the stud threads to a different nut, and use a washer or whatever. Otherwise get a new pipe from the online junkyard, carparts.com

Zip Ties!

Heres a few more things I want to ask. I dont mean to be a burden or anything though. Id like to do the repairs myself using oem toyota parts. I found this place where I can get the parts really cheap but still oem quality. I want to replace the front header pipe. I found the header pipe to be $91 thats the cheapest. What are all the other parts that I need to order besides the header pipe. What do I use to connect the front end of the catalytic converter to the end of the header pipe? Are there certain torque values I need to know. Also, there are bolts at the front of the header pipe that hold the pipe to the header. There are springs over these bolts. Ive been told that I have to compress them. How do I do that. Thanks and sorry for all the questions. I just want to do the repairs myself to avoid the arm and leg charges from the dealership.