This is a longer than standard muffler with 2.25, visibly, almost no difference aND the torque curves from mine and Bruce's dyno are almost identical, right down to the slight dip at the 3600-4100 RPM range (can't be felt by the but dyno).
Volume wise, it's very liveable and we'll mannered ...until you decide to wind it up. Over about 60% throttle it takes on a whole different sound, and flat out it is quite loud, but I really like that at 25mph I can talk with a pillion over my shoulder and then when I want turn all heads nearby with the go stick to make it louder.