YES 5.9 Magnum manifolds work in early A bodies. Here is exactly how!

dartfreak75 said

Thanks that is awesome. What flange did you use for that? So you welded the flange on the prebent tubing?

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Yes, that's the only way it can be done if you want mandrel bent pipe. Walker sells the flat flange on ebay. The donut can also be found on ebay. You have to weld the mandrel bent pipe to the flat flared end with the flange in place. Most muffler shop can put a flat flare on some 2 1/4" pipe.