compared to the 12" open reverse cone, yes, they are quiet, with a nice growl. this one is on my 750K8
you'll need to clamp them, and might want to weld a mount tab as they have some weight to them...
Cone Engineering 18" Quiet Core
Did you weld the tab on yourself Rob, or did you find a local shop to do it for you? Sounds great BTW I will have to hear it in person someday 
@FunJimmy - That was my old and tired, unknown mileage 4 owner K1 engine.

Cam rattle that wouldnt go away, leaky head, etc...sold it and dropped in a refreshed F3.
@Duanob - I found a welder about a mile from me. His shop is in the back of his house. He did it.
He rides a Duc999, and is working on a custom bent exhaust for his R90S.
He brews his own beer and will take a different kind of green for payment.

