You're running the HP tuner set up for tuning and monitoring, yeah? Did you run an output from your AFR gauge for logging data? If so, what output type did you use, like a 0 - 5v to the HPT dongle or a signal to an OBD2 pin?
That **** (b.u.n.g) weld ain't all bad, it's stick'n, not leaking, AND you used stainless weld metal. Those three criteria met, it's a win. Lol
I was a lazy puke and pulled B1S2, then put B1S1 in that port then stuck my Bosch AFR in the B1S1 port. My AFR worked well but the truck wasn't going into closed loop so I had to reverse it. My truck's mpg is low enough I don't need open loop all the time. She drank like she just turned 21.
Did you drop your midpipe to add the port or with it on truck?