I had wanted to revisit the exhaust, since the Supertrapp was still too loud; probably a sign of my advanced age. A friend gave me a nice can from a 600 cc sport bike (probably an earlier R6) that looked like a good choice. Unfortunately the bends were all in the wrong direction, and it was too long. Eventually I just grabbed the angle grinder and started cutting. In true bike fashion, a lot of engineering went into this. There is a perforated inner pipe (titanium), layers of baffle material, and then the shiny outer pipe, which I presumed to be stainless. After a lot of filing and fitting, I struck up the TIG, and was ready to do some nice stainless tigging (no worries, Briggs. I'm a long ways behind you.) After a good start, things went to hell in a handbasket in a hurry. The weld cracked faster than I could advance the puddle. Well, wouldn't you know. The outer pipe is titanium as well.
After some research, I knew I was in trouble. Back purging, dry room filler rod storage, post flow of 22 seconds and on and on. I don't even know where to get titanium filler rod, nor would I want to pay for it. Just as I was about to chuck the piece, I took the grinder to it once more, and lo and behold, my first little weld that I did without filler, was solid. Hmmm???
So back to filing and fitting (about 6 hrs in total), I went at it again. Stitched it 3/8 at a time, keeping it in the gas flow, cooling it slowly; it took me nearly an hour to work all the way around. And it seems to hold. I didn't take a hammer test to it, but with a good support, it may just stay together. And what a good support structure I found. Good planning on my part, no doubt.
So far I'm thrilled with the sound, now for some WOT testing.