I have one on my 01' 800....They are not much louder than stock for that year, but do sound a little better. As for HP gains, none...Only a slight weight savings advantage....Had it on a dyno, individualy w/ adds, and the can added nothing.
I have one on my 05 900. I bought a HTG pipe and it came with a Dyno Port silencer(they must work together on their products). Any how it doesn't sound too loud. I only ran it in my shop. Accually sounds pretty nice. Ceramic coated. Can't wate to try it out on the snow. Nice bark to it.
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