The tips are quite strong and were not a problem for me. My exhaust was being forced upwards and sidewards, I just stepped on the tips to take the stress off. I thought it might need heat but it didn't and was surprisingly easy. I may have sphincter blinked a few time though!
I was also thinking daxter that you could attach with rope or similar a pipe sideways to where the tips go into the muffler box. That will give you the strength and leverage to twist the pipe with maximum strength.
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