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You might be able to use a 3" reducer cone and just cut it short...eventually you'll end up at 2.5" somewhere along the taper.
Regarding the flanges. I'd wait until after they're all put together to have them ground, as they will warp from welding.
Bob
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My Flickr photos.
Jan. 3, 1984 - Jan. 3, 2009, that's 25 years of this damn Opelitis!
C.R.L. 9/22/69 - 12/8/99, J.M.L. 3/3/43 - 6/15/04
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