[vettestr]

Just another idea. The measurements of the sidepipes should accept a good old cherry bomb muffler. The outer diameter of muffler is about 3 3/8 inches with the ID at 2 1/2. Weld an adapter to center and seal each end agianst the ID of the side pipe. Think of a big washer for a mental picture. Washer would be just under 4 OD with center hole at 2 1/2 welded to each end of the cherry bomb that is 28 inch long.