It consisted of two pipes that joined at the opening in the rear cross member which were clamped together and held in place by the attachment of the clamp to the front lip of the cross member. The short pipe shown below has compound curves, but fortunately they are both in the same plane. The long pipe running from the rear of the muffler to the rear cross member also has compound curves, but not in the same plane. Accordingly, the two dimensional photos below of the long pipe are only partially helpful in the making of a duplicate. You likely can obtain a copy of the original engineering drawings of the two pipes from the Benson Ford Research Center in Dearborn to achieve your objective.
The upper of the two long pipes in the photos is the very early version which fit into the very early version of the muffler. The lower of the two long pipes is the one used for nearly all of the '32 model year. The front of that pipe fits over the pipe at the back of the muffler.