Pretty proud of it. I used a pocket bike 'fatboy' expansion chamber which dont seem to be around anymore. Scored it for $35! Because I lack metal shop tools and labour is so expensive in Australia I opted for plumbers copper pipe which has all sorts of ready made bends and pipe diameter reducers. To put it together all I have used is: A hack saw, a tube of 'Quick Steel' high temp epoxy resin putty (great stuff!) a tube of high temp silicone and a hose clamp.

I am going to hack off the end of my stock muffler and join it on, bit of a risk cos I don't want to have to rejoin it back on if something goes wrong...

95% sure it is all good.

Posting pictures of it insalled soon