Always learning here. Ti is bendable. and I'm sure it's alloy dependent.
Also, some stainless is magnetic, some is not. google. From web search: Pure titanium is not magnetic. It is a non-magnetic metal and does not react to magnetic fields. While titanium alloys may have some magnetic properties depending on their composition, pure titanium itself is not attracted to magnets

I've seen Ti parts not stamped Ti. I'm hoping somebody knows this exact bar.
I might pull the plugs, do the spark test and sell with that caveat. If I'm careful, I won't remove much more material than a minor crash.
I could also get the density using a large graduated cylinder and a balance but don't have a cylinder that will work. Size and shape makes awkward Archimedes.