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It sounds like you're going to pull the mufflers out of the hangers ... don't bother, it isn't worth it. Unbolting the hanger assemblies is 10x easier. Just transfer the assemblies to the new mufflers and bolt it back on again.
you cannot just slide them off, the bolts are not easy to get to but you have to take the hangers off.....you will spend more time and energy trying to slide them off IMO