I need to have a UEGO bung welded on my Dansk banana muffler. Can someone advise a good location clear of any baffling or packing materials? Thanks in advance. Ray

Pics would help, but that's a 2 in one out muffler? You should have 2 one at each inlet to the muffler (or better yet) on the ends of the heat exchangers nearest the muffler. If it's dual pipes going into each inlet then I personally don't think there is a good answer besides putting one on each - that's an overkill. I'd be concerned that you'll get too much fresh air contamination putting near the muffler outlet, and not enough mixture data putting it near the inlets.

It’s a four in one out set up with 2.0 HE’s. It is L-Jet so all cylinders get very close to the same amount of fuel. That makes mixing a smaller issue. I just don’t want to interfere with internal structures. Thanks for your input.