I've got a 2006 GT that has Flowmaster axle-backs and I'm guessing the previous owner put those on at least 5 years ago. I picked up a set of Roush axle-backs and tried to swap them in yesterday, started on the passenger side and had no problems with the four hanger bolts, loosened the pipe clamp, but for the life of me I couldn't wrestle the muffler loose. It looks like the winter salt here in the Midwest has corroded the pipes together. Normally I would just hack and butcher the old muffler to get it separated from the pipe, but I want to keep the Flomasters in decent shape so I can sell them. Any advice on how to break it loose w/o doing any damage?