I used it on a VIRAGO250 Drag pipe.
At low engine speeds, the treble sound was muffled compared to the Exhaust Interference Silence Type, resulting in a mild sound. If I had to say so, I would say that the bass sound remained.
However, when the Axel was opened to high RPM, it became difficult to open, probably due to the Glass Wool, and the sound seemed to become a little louder.
In contrast, with the Exhaust Interference Silence Type, the Axel was easy to open even at high RPM and the sound was not as loud. However, at startup and at low RPM, the sound is a bit high pitched and light.
In the end, we decided on the Exhaust Interference Silence Type inner silencer, which is easy to run.
Looks like you access from European region.
Would you shop at webike.eu.com?
