I just got the gmpp exhaust installed. Now I'm looking for a 2.5 downpipe with cat. Suggestions please. Thanks.

 

If you plan on getting headers someday in the future, you should just skip the d/p because headers come with d/p's. If not, then you should get one from ZZP or see if a local exhaust shop will make you a quality one. But I would go with ZZP personally if you're not getting headers.

 

x2 on ZZP

 

If I get the 304 stainless bolt-on with CAT do I need to add the bung for the 02 sensor or is it included?

 

Someone has one of those for sale on here. I didn't get it because I needed a 3" because I am supercharged.

 

You need to add the bung.