Originally Posted by monfreeze
A quick question, has the noise level now decreased?
"In the end it reduced the noise by ~1/2 (down 10 db)
but the best part is it attenuates the higher frequencies more so the remaining sound does not sound so tinny. You can still clearly hear the engine, especially when it is working hard, but it is quieter and sounds much better.
I am happy with the results"
Yep. Measured the db reduction with an iPhone sound meter app.