Dunno bout that, have heard that they all sound a little bit different to each other...a few of the guys where i come from have them, but they all have Aluminium, so cant vouch for this though???
I don't know myself, but I've heard that carbon cans don't get as hot as the titanium or aluminum ones. Might be something to consider if heat is an issue for you (..or your passengers).
TB titanium pipes going on my bike today! Got em, cause of the Carbon discolouring thing, and apparently, titanium pipes also have a very deep, gruff sound compared to aluminium. Dont get finger prints on them though, once the pipe gets hot, the print gets permanently etched into the surface!
So clean them real good after installation, before you fire the bike up after install!
i have the CF LEO's on mine... be aware though that the 07" is slightly different for the Leos so be sure to get the right model number when you order.