Heavy steel flange was/is slid over the 2 1/2" pipe and welded in place. Fits over studs in the manifold just fine and stood up to a lot of use & miles. I still have the old one (actually kept the entire aluminum exhaust less mufflers) from years ago and kept it because it was in such good shape. It'll go right on my new 67.
1967 Galaxie 500 Red original Q code 428
1967 Galaxie 500 White with Black stripes 428PI clone- car is dead & long gone, sold near Oak Ridge TN 2000, would love to find it.....
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