i just installed the Trust Ti-r on my car and took the silecner off and the CEL is on, the shop said i need to put on a o2 bung, so do i have to buy one and have them weld it on there? or is there anyway they can just do it?

 

Did you install a test pipe also? If yes you'll need a CEL fix. They're like $15 on Ebay.

 

So, I assyoume that your secondary o2 sensor is not installed? Yeah, fastenal carries the correct threaded nut that you can buy and have welded to work as a bung for like $.50. I forget the thread size/pitch. Or you can buy one from eBay of a muffler shop for around $5 plus shipping or more.

 

You can buy it here

http://www.gruppe-s.com/Evo/evoex.htm

 

^ if i buy that CEL fix, can i just screw it on and then it will be fine? what about emissions?