Tim Becker has come up with a real neat way to make up a division two turbine exhaust pipe( nozzle) it looks real nice and can be made up in any length.  Here are some pictures that show the process.  He used a 1.5 inch pvc flanged extension piece that you can find in the plumbing section of your local hardware or home improvement store. They come in six and twelve inch lengths. The outer part of the pipe is made from a 1 and 15/16th Outer Diameter medicine bottle with both ends either sanded down on a belt sander or cut off an then sanded.