I cannot speak for all exhausts, only the ones I have heard in person, on this bike. Comparing the stock, TORS, M4, Trident, Chain Reacton, Arrow, and Zard, I like the Trident sound best. Very deep and powerful sounding - I get compliments all the time on the sound of the bike.
Any laminated silencer (carbon or fiberglass) will absorb the high pitch tones that are simply reflected inside of a metal silencer. But be aware that some "carbon" silencers are mearly carbon over a metal can - like the earlier Triumph TORS for the 955 bikes.
Any laminated silencer (carbon or fiberglass) will absorb the high pitch tones that are simply reflected inside of a metal silencer. But be aware that some "carbon" silencers are mearly carbon over a metal can - like the earlier Triumph TORS for the 955 bikes.