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I had a tough one when I changed mine. I used a propane tourch and did the circle thing to open it up bit by bit to the point I could start turning the muffler.
I had a similar pack of fun with my old RK with mufflers that hadn't been removed in about 75k miles. Finally got them off with sheer will power and some help from a hammer and penetrating oil. I agree with the suggestion to use anti-sieze compound on the new setup, which will ease removal later.
I'm sure if you just loosend the clamps and took the bolts of the rear suspension point and drove the bike they would just fall off. Hope you didn't want to re-use them. They would prolly cause some commotion behind you with the cagers and get all scratched up when they fell. May not be in good enough condition to reinstall anyway if someone ran over them!
LOL
But, a little PB blaster, or some transmission fluid, or break cleaner (and don't get that break cleaner on any paint, it is pretty nasty to paint) could help making them come off easier. And if I remember mine right they have some slots in them around the bottom under the clamp. You can put the end of a pry bar and slightly open that slot to help more pennitrate get into the sleve of the muffler to the pipe then it should be like butter!
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