i'm pretty sure they have tips with the heated edges at your local auto parts store (pep boys, autozone).
i'm pretty sure they arent titanium, they are just heated enough to make them have the same effect.
i would do what bo suggested and just go to a metal shop and get the size pipe you want for the tip and get them to cut it the way you want (angled cut or flat cut, etc) and then just bring that tip to a muffler shop and tell them you want the piece you bring in to be the tip.
just make sure you check with the metal shop about melting temps to make sure you can weld a titanium tip to a stainless pipe because the materials melt at different temperatures. worst case, you'll have to get a different material that is heat treated at the tip to give the same effect, but since the effect is what you are looking for, i dont see that being a problem for you.