Wideband Bung position?

Where is the best place to put the wideband O2 bung?
I'm switching to LTs and a custom ORY (from MACs and Y with Magnaflow cats)
Right now I have it in the merge Y pipe, is there a better place for a better reading?
Thanks,
Mark
BTW how's the new setup running?

The merge isnt a bad spot, but that depends on what you are looking to do with it.






