I am on Taitec GTLW but it is quite loud, even with the silencer insert tips. I am thinking of getting HFCs as I hear it's the best way to reduce noise (and soot) without affecting flow.
The Fujitsubo is quite rare, but at least you can rest assured it won't rust and is lightweight. I think the sound is just a bonus. Do you have titanium bolts as well hooking it all up? I guess it's really not necessary if you don't drive it in the rain.