You need some thick washers/spacers with a notch cut into the side to match the 2 manifolds. They can be made from a piece of brass rod or thick walled tube. Basically a hack saw, a vice and a file, plus a drill is needed if using rod. Some patience too to get the first one right. It's surprising that no one makes and sells a set. Maybe a little project for someone?
As said, a bad move, going back to the single down pipe.
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