Reason I'm asking is that the 2nd o2 sensor goes into the Y so replacement of this forces adding a welded in nipple to mount the O2 sensor in the replacement pipe. When they do my X pipe I know we have a couple options to work around this, just curios what some other people have done.

 

 

That is not a very good picture. Irutt please look around.

 

On mine there was approximately 3" behind the oxygen sensor on the passengers side before the OEM Y-pipe. I sawed it off as close to the Y-intersection as possible. This allows plenty of room to add on behind the oxygen sensor with a new Y-pipe for a single or to use it for one of your duals. The driver's side is far from any problems. This method is for those who want to use the OEM headpipe/cats/oxygen sensor location. I removed the oxygen sensor due to welding proximity then reinstalled it. It is in the factory location/bung.

 

there was not a O2 sensor in my y pipe thats the location of the old y pipe and i think its a damned good pic