I'm thinking about purchasing a new cat back exhaust. I keep hearing about a second o2 sensor after the cat. Do most of the aftermarket exhausts have a spot for the second o2 sensor to go? The only one that I found that specifically said it had a bung for the second o2 was the HKS HI-POWER DUAL EXHAUST. Basically I don't want to throw a cel.
Thanks

 

Most exhaust does have the bung welded on. However, it does not cost much to get on welded on if it doesn't.

 

I have ebay exhaust and it has 2nd o2 bung in Cat Back section.

 

Thanks! Now I have the impossible task of figuring out which one to go with. Decisions...Decisions....