I have a set of pacesetter Lts and a Pacesetter Y pipe sitting in my second bedroom waiting to go on the truck. The thing I have have a question about are the O2 non-foulers. I know the ones for the up stream O2's go into the collector correct and the down stream O2s are for the non-foulers. How far down on the new Y do they need to go? And they need a new bung welded in for them too since the Y does not have them correct? Any of you guys have a pic of your setup with the non foulers on?

Also on a side note, how much louder am I looking at the truck being without the cats on there vs with them on? Is it deafening loud, to loud to hold a conversation cruising down the road? Just curious...

The non foulers should only go on the back 2 o2 sensors. If your y pipe doesn't already come with a bung for the back o2 sensors then yes, you will have to get them welded in. The back o2 sensors can go anywhere after the cat.

If you want to go no cats, it will be louder but not deafening loud. There is supposed to be an advantage in exhaust flow from running with no cats so I took them out.