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I have the Megan Catback and they say it requires the sensor pipe between the bpipe and cat, which it does. So this pipe could've been used to bypass the sensor pipe, as long as you dont have one on your car, then that's probably what it was used for.
Also that weld on the bpipe seems like it connected the way megan had it when you get the catback. there are usually 3 pipes, the bpipe shows up in 2 pieces, so i think they just cut the flanges and welded the bpipe into one piece.
Good luck with the sale.