I don't think I'll worry about the exhaust just yet. There are lots of things that are more important.
This will need replacing;
and this has got to be one of the dodgiest things I've seen for a while.
I did manage to score a Metzler Z1 for the back and he is getting me a new front tyre, then it will need stripping down and a proper coat of paint. Mind you, the finish isn't too bad for a spray can - 'cept where he painted over the original stickers. A few minor cracks in the plastics will need welding. Then there is the front wheel.

It's taken a bit of a knock. It doesn't seem to affect the rideability but I was planning on polishing the rims.
Motor wise it seems pretty sound. It runs like a dream when warm, but a total pig when its cold - and of course it had been run before I took it for a test ride yesterday

A good service and a carby balance should fix it up. It will keep me out of mischief for a while and for the money I paid I got nothing to complain about.