Hub bought with bike then bill lost in abyss!That's strange. So the bike came with the pipes on from the dealer, the dealer says to fight it out with Yosh? Talk about pass the buck. Well anyway, seems Yosh did you right.
Could that have been a dealer install tweak to the stress? That's why you want to float that header first. Wherever that sits all tight by itself, you see no stress. Now you work off the next pipe and unstress that next section to make it float at its happy position. Then mod from there. Who knows? I'm just saying.