and you think this is loud

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Not the loudest but its not a silencer that I would think you could call quiet either.
I know many of the people running the more straight thru designed silencers do not maintain the packing and that makes them even louder, and this was the very silencer that the rider I talked about thinking and saying his quad sounded faster etc was running.
It looks to be a well built and performing silencer (this is not debated by me at all) but its performance gains are at the cost of being loud.
Some silencers get their hp gains from design and others from just being unrestrictive, and yet others are just loud and dont see gains in comparison to their overly loud level of sound.
I guess I personally would consider the T4 to be on the higher end of the loudness scale but also on the higher end of the performance scale (when the packing is maintained) but thats only my opinion so take it for what its worth.