The exhaust pipes are molded poorly and fit together the same way. A lot of clean-up is required on each half of each pair. Then even more filling and sanded is needed after they are cemented together. The ends were different diameters on the left than on the right so I added the same size brass tubing to make them equal at the tips at least...

When I installed the exhausts , the ends in no way would align with the holes in the body so I cut the tail pipe sections off and drilled pilot holes to pin them back together at a more appropriate relation to the body exits.