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I clamped them to a piece is 50x50x5 angle and a saw stand. The Flanges were not flat to begin with. I also fused around the ends of the pipe (head side) as due to the tight bends the pipes were not completely square on the end and I didn't wanted a smooth transition into the pipe.
I just had a local muffler shop skim a bit off to make sure they were flat. Wish I had a mill!
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