Header leak

Backed off the bolts and torqued them center out and it was fairly quiet until she got warm. I also put some of the copper rtv over the known area that the headers were leaking which was very apparent when I pulled the original gasket and it was burned through it looked like it was the number 4 exhaust port as the issue. I also ran a thethescope prior to that and had it nailed down to that area. With the car running once she warmed up I also stuck a hand against both tailpipes and drivers side blewy hand off no problem passenger side however which is the problem side did not, I have a hunch my leak could also be in the collector or where two pipes clamp together. I plan to mess with that today.
Thanks again for the suggestions.