Like I said, I did it both ways ... the pictures above are of the butt welding method. I will take more pictures tonight of the my other up-pipe along with internal measurements. Due to the other flange's opening being much larger, I had to swedge the pipe out quite a bit, so I think my other flange is actually wider inside. Both look good ... however, I see a difinite improvement in my welding on this one.

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