I'm trying to redo the mufflers on Big Ugly. They've been there a while but the pipes are in pretty good shape. They have surface rust but are sound. However one of the mufflers has bad rust by the lip of a seam so I'm taking the opportunity to replace them with some Cherry Bombs that I found that should be a direct replacement. However they're on there good and tight and won't wiggle off as I'm pulling on them. I took the clamps off of each end, whacked them with the hammer all over, and doused each end in PB'laster. Any thoughts on how to get the mufflers out?