I made a litho outer pipe for my SuperSport pipe.

I rolled it around a bit of slightly smaller plastic drain pipe to get a nice tube with about 10mm overlap.
I used pop rivets & some silicon to make the join.

The tricky bit was supporting it. At the back it overlaps the cookie cutter rear pipe mount & at the front it rests in a hole cut in a former holding it an even distance from the pipe which is, of course, supported by the straps. I pop riveted a tiny piece of aluminium angle on it to stop it sliding forward.

I followed the instructions with the Wren pipe for dimensions & spacing.

Having said all this I have not run the engine in this plane yet. I hope it all works! [sm=72_72.gif] - John.