If it is the vertical exhaust stack you are looking for, I had the local muffler shop make me up one about three feet long. Its nothing but a piece of thin wall pipe, They even belled the end so it would fit over the muffler section and clamp with a U bolt. I made it long enough to shoot the diesel exhaust out above my head. My first try was too heavy and they got some very thin wall tubing to use for the second one. I think I paid about twenty bucks.