I suspect you may be right: I did find a Yoshimura bike pipe which appeared to be Ti throughout (of course, Yoshi is Japanese American) bends look like mandrel or a CNC process, possibly thicker wall than I have in mind, and I've seen some US pipes which look as though the bends have been stamped out and then welded together (rather like you might do if you were hammerforming in aluminium).
I'll do some measuring and emailing later, but it looks like I may have to do some gentle cut and shut curves. Still, I can practice on the 3" tube -- too big for anything but a tail pipe!
I'll do some measuring and emailing later, but it looks like I may have to do some gentle cut and shut curves. Still, I can practice on the 3" tube -- too big for anything but a tail pipe!