Hi Russ.
I'm pretty sure the cans are Sebring judging by the end caps and the riveting. Here's an example:
Sebring exhausts only carry a crappy "heatproof sticker" so often fall off, or are removed by owners, which would explain the lack of branding. The sticker would have been where the strap is on yours, so this is probably they have gone. Of course the link pipes could by another manufacturer?
I don't think what you've got is an "off-the-shelf" setup for an XTX looking at they hangers/straps and the way it's arranged?