http://www.importscene.com.au/prod466.htm


Description sounds very promising.

says it will reduce up to 10db, which I don't know is how much in real life

What are your opinions on this?

I'm trying everything to quieten down my 3inch single exhaust.

I've got a silencer in the end but it still drones quite a bit.

Would this help reduce the noise of drone??

 

yes, it works like a silencer, but it only quiets it up a little bit

 

so if it's fully closed you're restricting your exhaust flow completely. but they say to drive with it fully closed for max sound reduction... i wonder how much power this loses.