I have the bbk attached to bbk x-pipe, had to do a little filing to get the connection perfect on one of the cat-delete pipes, but after doing so I have zero issues or exhaust leaks.
I have BBK.... Junk, muffler ship had to cut the H pipe at the welds in order to get them to fit correctly then weld the H-pipe back on.
Yeah, Is that the one that caused you to weld it?