Hi Jim,
I was a bit anxious myself about how loud my new Scorpions would be, particularly when they arrived and on the box was "For Racing Only".

My set did not come with the DB killers.
However, when I fired the bike up after the install, the sound was GLORIOUS, not obnoxious at all. They have a healthy rumble at idle, and a great sound under acceleration....again, not "loud", but more of a "snarl". I like that. They sound great on downshift (blipping between downshifts). When cruising at a steady speed on the highway, all I can hear is a nice, subdued "Puuuurrrrrrrrr" from the Scorpions.
IOW, don't worry about them...the sound is quite acceptable and you won't be regarded as an irresponsible a-hole. :thumbup:
I have heard the 3 Bros and the Leo-Vinces and imho they have a raspy "edge" to the sound that is not nice....they are just LOUD. The Scorp's have a quality sound that really wakes up the R6-ish motor in the FZ6. Scorpions are British made, and the Brits have always understood what a motorcycle engine should sound like. They hit a home run with the FZ6 Scorpions. :Sport:
Hope this helps!
Mike