Yeah I think two per cat are bolts and one is a stud threaded into the hole on the header. Therefore, you just leave the stud there, remove the bolt and then re-use the bolt when bolting the new piece up.
The top of the stud (engine side) I believe has a star fitting so you can unscrew it though.
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2013 Ford Mustang GT
374rwhp, 360rwtq SAE / GT500 Axle-Backs / Brembo Pack / Track Pack / Recaros / 6spd
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