Still going bike exhaust coming on, stepping the tube up to the size of the rear can, probably could have done it many ways but wanted it to be in sections due to all the pipe cuts. I’ll run the 42 mm inside the expansion to keep the whole system the same size to the can.
When I first started Tig, my welds looked terrible. Nothing structurally significant so I'd tidy them up a bit by washing over the joint. I’m told that’s a big “no” because it can weaken it.