Next job to get the header to the muffler. As I'm running 2.5 inch mufflers, but this steps down to 2 inch, so I had to modify the mufflers in readiness. I'm lucky in that i have access to various tools at my forge. So I popped a couple of lengths of 2 inch tube in my gas forge, got them nice and hot, then stretched them over my small cone. Next I cut off the outlet end off the muffler, trimmed the cone down, then welded it and a flange on, plus added a larger flange to the inlet.